Core Java Basics And Learn Programming Concepts

core java topics and concepts for beginners| [2021]

2021-04-26T18:04:00.004+05:30

Today, you're more likely to be requested questions in the regions of Java a programmer may not typically be acquainted with, e.g. NIO patterns, algorithms, data structures, and coding. False sharing can be tough to recognize since the ribbon could be highlighting entirely different global factors that have been rather close together in memory.

Response : Immutable objects are described as people whose state can't be altered once it's been created, any alteration is going to bring about a brand new item, e.g. String, Integer, along with other wrapper class. There's absolutely no method of guaranteeing which queries you'll be asked in a meeting, but it is always better to be more knowledgeable about the often asked center Java interview questions. There are a Couple of subject areas to Concentrate on when preparing for a Java interview and you need to brush up on the following regions.

Response : String is immutable in Java since Java designer believed that String will be heavily used, which makes it immutable. It allows some optimization simple sharing, and also same String object between multiple customers.

Can it be feasible to earn variety volatile in Java?

This will teach JVM to publish thread ditch in regular out, and it might visit games or log file based upon your program settings. Response : No, it's not feasible to keep a double value into a very long factor without casting since the assortment of dual is more, which means that you'd have to type cast.

Response : wait() method should be predicted in loop. ) It's very likely that, before the thread gets CPU to begin running , the status might not hold. Because of this, it's always recommended to examine the problem in loop prior to continuing.

learn more : A complete list of core java topics list?

Which course Includes strategy: Cloneable or Object?

Response : When memory isn't a concern and functionality isn't crucial, BigDecimal is going to be the ideal data type signify a cost in Java.

What's described as an immutable thing? How would you produce an immutable thing in Java?

Java interviews are proven to be a little different compared to other classic programming interviews. Firstly, despite the fact that there'll be queries regarding Data Structure and Algorithms, e.g.

String or Array, you will continue to have the ability to clear those interviews if you're not a technical specialist within them. As a Java programmer, it might be well worth reading this book to take you through a number of the most significant issues for Java interview, even when you are not specifically interviewing.

Response : The two will have the exact same amount of sophistication regarding composing the code since synchronisation is different from the amount of threads, even though the alternative of synchronisation may be subject to the amount of threads since this introduces more battle.

You have got the meeting --now what? Though some job interviews may follow a simple, easy question and response format, at the Java sector, preparing for a meeting could be slightly harder. But it's essential to be careful when utilizing a thread local variable at a controlled environment, e.g. with servers in which employee thread outlives any program factor. You are not able to upgrade overlapping parts, e.g. JTable, JList or even Jpanel from any ribbon. In reality, they need to be upgraded from a GUI or AWT thread.

This Is the Reason Why Swing's provide Response : Yup, it's possible to generate a variety volatile in Java, but only the mention that's pointing to a range, not the entire collection. Consequently, if one thread changes the benchmark factor points to a different variety, which will offer a volatile warranty.

Consequently would opt for an innovative synchronisation technique, e.g. lock emptying, which necessitates more complex code and competence.

What's constructor chaining in Java?

Can it be feasible to utilize String from the change case?

With Java being accessible as long as it's, there are a few dependable and credible publications available to help prepare Java interviews.

Response : To convert bytes into String, you'd use Powerful constructor that takes byte[]. Bear in mind that clone() is a native system, thus it's used in C or C++ or some other native programming language. Response : ++ isn't thread-safe in Java since it involves several controls like reading a value, implicating it, then storing it into memory.

Response : Thread-local factors are factors restricted to a ribbon. It's similar to thread's own backup that's not shared between a large number of threads. Java delivers a ThreadLocal course to upkeep thread-local factors. This is only one of many tactics to ensure thread-safety.

What's String immutable in Java?

The goal is to moderate temporary String object by discussing them in order to talk about, they need to need to be from immutable course.

What's the correct data type to represent a cost in Java?

What is the distinction between Callable and Runnable?

Response : Yup, it's possible but int is 32 bit long in Java, whilst byte is 8 bit extended in Java.

Describe exactly what a thread-local factor is in Java

Contemplating Java is principally used as an application programming language, the attention is connected accordingly with queries usually focusing on API and core theories. This normally happens when you have multiple, overloaded constructor from the class.

LMAX Disruptor frameworks, a high performance inter-thread messaging library includes a BusySpinWait Strategy, which can be centred with this version and utilizes a busy twist loop for EventProcessors awaiting the barrier. Very similar to several other concurrency problems, the principal means to prevent false sharing would be to thoroughly examine your code and encouraging your information structure together with all the size of a cache line. Response : Yes, it is possible from Java 7 ahead.

String may be utilised in switch case, however it's simply syntactic sugar. Internal series hashcode can be used for the change. In reality, they need to be upgraded from a GUI or AWT thread. That is the reason why Swing's supply invokeAndWait() and invokeLater() method to ask GUI upgrade from other threads. Any thread local variable that isn't removed after its work is completed may hypothetically cause a memory leak in Java program.

Can it be feasible to keep a double value in a lengthy term without casting?

What would occur if the value of int is bigger than byte? If the objective is to offer memory visibility assurance for person indices of the selection, volatile is not any practical use for you. Instead, you need to rely on an alternate mechanism for thread-safety in that specific scenario, e.g. utilization of a synchronised keyword.

How can you convert bytes into String?

By them both, which might be a lot easier to compose: synchronisation code for ten threads or even 2 threads?

Because of this, if you're working on a low latency system wherever your purchase processing thread is not in any specific sequence, instead of calling or sleeping wait(), then you can simply loop then review the queue for new messages.

What's the passing keyword used in Java?

It's well worth notingthat it is not feasible to talk about a mutable job with two parties that are unfamiliar to one another. These methods set upgrade requests in AWT threads queue and then await the update or return directly off for an asynchronous upgrade.

Layout designs and layout questions associated with your own projects.

Can you use if loop or block, and why? That is the reason it releases lockwhich may subsequently be developed by another thread to change the status of which it's waiting.

How can you choose ribbon dump in Java?

Response : Thread.run() will perform from the calling thread, i.e. a new thread isn't created, the code has been implemented synchronously. Thread.start() will implement exactly the exact same code, but at a brand new asynchronous thread.

What exactly do the Thread.class approaches run() and begin () do?

But if a few threads are changing particular array components, there will not be some occurs before assurance offered from the volatile modifier for this alteration. Concepts from heart Java.

Response : The two are utilized to pause thread that's presently running, nevertheless, sleep() is intended for brief pause since it doesn't release lock, whilst wait() is intended for conditional wait. But you should be conscious of the ideal character encoding differently the system's default character encoding will be used, which might not always be the same. Response : Both of them are interfaces used to perform action to be executed by a thread.

The principal difference between the two ports is that Callable could yield a value, while Runnable can't. Another distinction is that Callable will throw a checked exception, while Runnable can't. Response : A integer thing will require more memory because it stores metadata overhead regarding the item. An int is crude, so it requires less space.

Response : By employing kill -3 PID from Linux, where PID is the process identification of Java procedure, it is possible to have a thread dump of Java program.

Back in the day, it was about understanding the difference between particular programming languages, however today Java interview questions are getting more advanced. Response : The transient keyword is used to signify a field in class Shouldn't Be serialized (used using the Serializable interface)

Additional: Response : java.lang.Cloneable is mark interface and doesn't include at any way. Clone procedure is well-defined in the item category. Response : Lively spin is known among the methods to await events without alerting CPU.

This can be done to prevent losing information in CPU cache, which might get lost when the thread is paused and resumed in another core.

Read more about core java :- core java topics list

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2021-04-25T16:34:00.001+05:30

What Is Happy Number In Java And Check Number Is Happy Or Sad?

2020-09-04T19:00:00.003+05:30

Dear reader this Article is all about happy and sad numbers. in this post, I will teach you what is a Happy and Sad number with the help examples, and also we perform an operation of the program to check happy number in java.

let's Understand what is Happy Number in java:-

Definition:- Any positive integer which is starting from 1 (Greater than 0), and replaces the number by the sum of the squares of its digits, and repeats the all process until the final result becomes 1.

For Example check 28 is Happy or Not?

2² + 8² = 4+64 =68
6²+8² = 36+64= 100
1²+0²+0²= 1+0+0= 1

we get 1 that's means this number is a Happy Number.

NOTE:- if we are not getting 1 that means the number is sad Number.

Here is the list of Happy no under 100:- 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, and also 100.

Java Code:-

1:  import java.util.Scanner;  
2:  public class HappyNos {  
3:  static boolean ishappy(int n)  
4:  {  
5:  while(n>9){  
6:  int sum=0;  
7:  while(n!=0){  
8:  int r=n%10;  
9:  sum=sum+r*r;  
10:  n=n/10;  
11:  }  
12:  n=sum;  
13:  }  
14:  return n==1||n==7;  
15:  }  
16:  static void happyno(int n){  
17:  System.out.println("Happy nos are");  
18:  for(int i=1;i<=n;i++){  
19:  if(ishappy(i)){  
20:  System.out.print(i+ " ");  
21:  }  
22:  }  
23:  }  
24:  static int counthappy(int n){  
25:  int count=0;  
26:  for(int i=1;i<=n;i++){  
27:  if(ishappy(i)){  
28:  count++;  
29:  }  
30:  }  
31:  return count;  
32:  }  
33:  static int sumhappy(int n){  
34:  int sum=0;  
35:  for(int i=1;i<=n;i++){  
36:  if(ishappy(i)){  
37:  sum=sum+i;  
38:  }  
39:  }  
40:  return sum;  
41:  }  
42:  public static void main(String[] args) {  
43:  Scanner sc=new Scanner(System.in);  
44:  System.out.println("Enter the no");  
45:  int n=sc.nextInt();  
46:  boolean b=ishappy(n);  
47:  if(b)  
48:  System.out.println("Happy no");  
49:  else  
50:  System.out.println("Not happy no");  
51:  happyno(n);  
52:  int cnt=counthappy(n);  
53:  System.out.println("\ntotal happy are "+cnt);  
54:  int sm=sumhappy(n);  
55:  System.out.println("total happy are "+sm);  
56:  }  
57:  }

Output:-

 Enter the no  
 21  
 Not happy no  
 Happy nos are  
 1 7 10 13 19  
 total happy are 5  
 total happy are 50

Explanation of some important lines:-

first of all, we create a class.
creating a static method (ishappy).
in this method, we are using a while loop.
create a variable.
after then again using while loop.
return values after the crack loop.
create one more static method (happyno).
used println method for printing happy numbers.
using for loop.
using if condition.
create one more static method (counthappy).
using for loop.
one more static method (sumhappy).
run for loop.
create the main method.
import Scanner class.
use if else condition.
create a variable and put counthappy method.
printing the total number of count.
create one more variable and put the sumhappy method.
print the total happy number sum.

learn java from basic to advance.

Admin Words:- I am tried to solve all these happy number in java. This program will help you to understand the sad and happy number in java.

If you find any error in this program reminds me of the comment. and if you have any questions regarding this program please feel free to ask in the comment below of this post.

Recommended:-

All Java Pattern Program List To Grow Coding Logical Skills.

2020-08-31T17:33:00.001+05:30

Hello Dear Reader, in this article I will provide you All Java Pattern Program List. which is helps you to improve your coding skills logically? if you are trying to improve your coding skills. definitely, these programs help you.

Every interview has a coding round. that is also an important part of interviews. if you have good skills in programming. on that round, you need to show your coding skills to crack the interview.

It also depends on your logical capability. how much you can write short and effective code. and Java Pattern Programs are also the hardest part of the interview.

Now you don't need to worry about the solution of all these pattern programs of java. Here I will add all the questions and solutions to the pattern.

if you have more Java Pattern Programs then you need to share with Others so Please add more patterns in the comment section.

List of Number Pattern Programs In Java

Pattern 1:- Number Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern1  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j <= i; j++)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   }  
22:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 1 2  
 1 2 3  
 1 2 3 4  
 1 2 3 4 5

Program Summary:-

Creating a class.
using main method.
importing Scanner class.
getting input from the user with the help of println method.
creating a variable.
Using "for" Loop.
Printing output of our program with println.

Pattern 2:- Number solution program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern2  
4:  {  
5:      public static void main(String[] args)  
6:     {  
7:         // Create a new Scanner object  
8:         Scanner scanner = new Scanner(System.in);  
9:         // Get the number of rows from the user  
10:        System.out.println("Enter the number of rows to print the pattern");  
11:        int rows = scanner.nextInt();  
12:        System.out.println("** Printing the pattern...**");  
13:        for (int i = 1; i <= rows; i++)  
14:         {  
15:            for (int j = 1; j <= i; j++)  
16:              {  
17:                 System.out.print(i + " ");  
18:              }  
19:              System.out.println();  
20:         }  
21:      }  
22:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 2 2  
 3 3 3  
 4 4 4 4  
 5 5 5 5 5

Pattern 3:- Number Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern3  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j <= i; j++)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   for (int i = rows; i >= 1; i--)  
22:   {  
23:   for (int j = 1; j < i; j++)  
24:   {  
25:   System.out.print(j + " ");  
26:   }  
27:   System.out.println();  
28:   }  
29:   }  
30:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 1 2  
 1 2 3  
 1 2 3 4  
 1 2 3 4 5  
 1 2 3 4  
 1 2 3  
 1 2  
 1

Pattern 4:- K Shape Numbers Patten Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern4  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = rows; i >= 1; i--)  
14:   {  
15:   for (int j = 1; j <= i; j++)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   for (int i = 1; i <= rows; i++)  
22:   {  
23:   for (int j = 1; j <= i; j++)  
24:   {  
25:   System.out.print(j + " ");  
26:   }  
27:   System.out.println();  
28:   }  
29:   }  
30:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 2 3 4 5  
 1 2 3 4  
 1 2 3  
 1 2  
 1  
 1  
 1 2  
 1 2 3  
 1 2 3 4  
 1 2 3 4 5

Pattern 5:- K Shape Ascending Order Numbers Patten Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern5  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = rows; i >= 1; i--)  
14:   {  
15:   for (int j = i; j >= 1; j--)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   for (int i = 1; i <= rows; i++)  
22:   {  
23:   for (int j = i; j >= 1; j--)  
24:   {  
25:   System.out.print(j + " ");  
26:   }  
27:   System.out.println();  
28:   }  
29:   }  
30:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 5 4 3 2 1  
 4 3 2 1  
 3 2 1  
 2 1  
 1  
 1  
 2 1  
 3 2 1  
 4 3 2 1  
 5 4 3 2 1

Pattern 6:- Numeric Tringle pattern in java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern6  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = rows; j > i; j--)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   for (int k = 1; k <= i; k++)  
20:   {  
21:   System.out.print(k + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   }  
26:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
      1  
     1  2  
    1  2  3  
  1  2  3  4  
1  2  3  4  5

Pattern 7:- Downward Descending Numeric pattern in java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern7  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = rows; j >= i; j--)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   }  
22:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 5 4 3 2 1  
 5 4 3 2  
 5 4 3  
 5 4  
 5

Pattern 8:- Descending Numeric pattern.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern8  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = rows; i >= 1; i--)  
14:   {  
15:   for (int j = rows; j >= i; j--)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   }  
22:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 5  
 5 4  
 5 4 3  
 5 4 3 2  
 5 4 3 2 1

Pattern 9:- Downward Ascending Numeric Pattern In Java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern9  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = rows; i >= 1; i--)  
14:   {  
15:   for (int j = 1; j <= i; j++)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   }  
22:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 2 3 4 5  
 1 2 3 4  
 1 2 3  
 1 2  
 1

Pattern 10:- Design Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern10  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   int k = 1;  
13:   System.out.println("** Printing the pattern... **");  
14:   for (int i = 1; i <= rows; i++)  
15:   {  
16:   for (int j = 1; j <= i; j++)  
17:   {  
18:   System.out.print(k + " ");  
19:   k++;  
20:   }  
21:   System.out.println();  
22:   }  
23:   }  
24:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 2 3  
 4 5 6  
 7 8 9 10  
 11 12 13 14 15

Pattern 11:- Right Tringle Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern11  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = i; j >= 1; j--)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   }  
22:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 2 1  
 3 2 1  
 4 3 2 1  
 5 4 3 2 1

Pattern 12:- Count Lins with Line Space Right Triangle Design Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern12  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   int temp = i;  
16:   for (int j = i; j >= 1; j--)  
17:   {  
18:   System.out.print(temp + " ");  
19:   temp = temp + rows;  
20:   }  
21:   System.out.println();  
22:   }  
23:   }  
24:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 2 7  
 3 8 13  
 4 9 14 19  
 5 10 15 20 25

Pattern 13:- Pascal's Triangle Design Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern13  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = rows; j > i; j--)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   int temp = 1;  
20:   for (int k = 1; k <= i; k++)  
21:   {  
22:   System.out.print(temp + " ");  
23:   temp = temp * (i - k) / (k);  
24:   }  
25:   System.out.println();  
26:   }  
27:   }  
28:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
     1  
    1 1  
   1 2 1  
  1 3 3 1  
 1 4 6 4 1

Pattern 14:- First half and Second Half Numeric Design Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern14  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j <= i; j++)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   for (int k = i - 1; k >= 1; k--)  
20:   {  
21:   System.out.print(k + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   }  
26:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 1 2 1  
 1 2 3 2 1  
 1 2 3 4 3 2 1  
 1 2 3 4 5 4 3 2 1

Pattern 15:- Revers Numeric Triangle Design Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern15  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j < i; j++)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   for (int k = 1; k <= rows - i + 1; k++)  
20:   {  
21:   System.out.print(k + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   }  
26:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 2 3 4 5  
  1 2 3 4  
   1 2 3  
    1 2  
     1

Pattern 16:- Revers Numeric Triangle Design Pattern Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern16  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = rows; j > i; j--)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   for (int k = 1; k <= i; k++)  
20:   {  
21:   System.out.print(k + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   for (int i = 1; i <= rows; i++)  
26:   {  
27:   for (int j = 1; j <= i; j++)  
28:   {  
29:   System.out.print(" ");  
30:   }  
31:   for (int k = 1; k <= rows - i; k++)  
32:   {  
33:   System.out.print(k + " ");  
34:   }  
35:   System.out.println();  
36:   }  
37:   }  
38:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
            1  
          1   2  
       1    2   3  
    1    2   3     4  
 1    2   3     4    5  
    1    2   3     4  
       1    2   3  
          1   2  
           1

Pattern 17:- Revers K Shape Numeric Design Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern17  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j < i; j++)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   for (int k = i; k <= rows; k++)  
20:   {  
21:   System.out.print(k);  
22:   }  
23:   System.out.println();  
24:   }  
25:   for (int i = rows; i >= 1; i--)  
26:   {  
27:   for (int j = 1; j < i; j++)  
28:   {  
29:   System.out.print(" ");  
30:   }  
31:   for (int k = i; k <= rows; k++)  
32:   {  
33:   System.out.print(k);  
34:   }  
35:   System.out.println();  
36:   }  
37:   }  
38:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 12345  
  2345  
   345  
    45  
     5  
     5  
    45  
   345  
  2345  
 12345

Pattern 18:- Diamond Numeric Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern18  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j < i; j++)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   for (int k = i; k <= rows; k++)  
20:   {  
21:   System.out.print(k + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   for (int i = rows; i >= 1; i--)  
26:   {  
27:   for (int j = 1; j < i; j++)  
28:   {  
29:   System.out.print(" ");  
30:   }  
31:   for (int k = i; k <= rows; k++)  
32:   {  
33:   System.out.print(k + " ");  
34:   }  
35:   System.out.println();  
36:   }  
37:   }  
38:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 2 3 4 5  
  2 3 4 5  
   3 4 5  
    4 5  
     5  
     5  
    4 5  
   3 4 5  
  2 3 4 5  
 1 2 3 4 5

Pattern 19:- Diamond Numeric Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern19  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = rows; i >= 1; i--)  
14:   {  
15:   for (int j = 1; j < i; j++)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   for (int k = i; k <= rows; k++)  
20:   {  
21:   System.out.print(k + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   }  
26:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
     5  
    4 5  
   3 4 5  
  2 3 4 5  
 1 2 3 4 5

Pattern 20:- First and Second Half Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern20  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = rows; j > i; j--)  
16:   {  
17:   System.out.print(" ");  
18:   }  
19:   for (int k = 1; k <= i; k++)  
20:   {  
21:   System.out.print(k);  
22:   }  
23:   for (int l = i - 1; l >= 1; l--)  
24:   {  
25:   System.out.print(l);  
26:   }  
27:   System.out.println();  
28:   }  
29:   }  
30:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
     1  
    121  
   12321  
  1234321  
 123454321

Pattern 21:- Zero And One Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern21  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j <= i; j++)  
16:   {  
17:   System.out.print(j % 2 + " ");  
18:   }  
19:   System.out.println();  
20:   }  
21:   }  
22:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 1 0  
 1 0 1  
 1 0 1 0  
 1 0 1 0 1

Pattern 22:- Rectangle Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern22  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = 1; j < i; j++)  
16:   {  
17:   System.out.print("0 ");  
18:   }  
19:   System.out.print(i + " ");  
20:   for (int k = i; k < rows; k++)  
21:   {  
22:   System.out.print("0 ");  
23:   }  
24:   System.out.println();  
25:   }  
26:   }  
27:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 0 0 0 0  
 0 2 0 0 0  
 0 0 3 0 0  
 0 0 0 4 0  
 0 0 0 0 5

Pattern 23:- Downward Revers Number Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern23  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = rows; j > i; j--)  
16:   {  
17:   System.out.print(1 + " ");  
18:   }  
19:   for (int k = 1; k <= i; k++)  
20:   {  
21:   System.out.print(i + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   }  
26:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 1 1 1 1  
 1 1 1 2 2  
 1 1 3 3 3  
 1 4 4 4 4  
 5 5 5 5 5

Pattern 24:- First And Second Half Downward Numeric Pattern Program in java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern24  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 1; i <= rows; i++)  
14:   {  
15:   for (int j = i; j <= rows; j++)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   for (int k = rows - 1; k >= i; k--)  
20:   {  
21:   System.out.print(k + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   }  
26:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 2 3 4 5 4 3 2 1  
 2 3 4 5 4 3 2  
 3 4 5 4 3  
 4 5 4  
 5

Pattern 25:- Same Number Triangle Pattern Program in java.

1:  Pattern 25:  
2:  package com.javainterviewpoint;  
3:  import java.util.Scanner;  
4:  public class Pattern25  
5:  {  
6:   public static void main(String[] args)  
7:   {  
8:   // Create a new Scanner object  
9:   Scanner scanner = new Scanner(System.in);  
10:   // Get the number of rows from the user  
11:   System.out.println("Enter the number of rows to print the pattern ");  
12:   int rows = scanner.nextInt();  
13:   System.out.println("** Printing the pattern... **");  
14:   for (int i = 1; i <= rows; i++)  
15:   {  
16:   for (int j = rows; j > i; j--)  
17:   {  
18:   System.out.print(" ");  
19:   }  
20:   for (int k = 1; k <= i; k++)  
21:   {  
22:   System.out.print(i + " ");  
23:   }  
24:   System.out.println();  
25:   }  
26:   }  
27:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
     1  
    2 2  
   3 3 3  
  4 4 4 4  
 5 5 5 5 5

Pattern 26:- Downward Rectangle Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern26  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = rows; i >= 1; i--)  
14:   {  
15:   for (int j = i; j < rows; j++)  
16:   {  
17:   System.out.print(j + " ");  
18:   }  
19:   for (int k = rows - i; k < rows; k++)  
20:   {  
21:   System.out.print(5 + " ");  
22:   }  
23:   System.out.println();  
24:   }  
25:   }  
26:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 5 5 5 5 5  
 4 5 5 5 5  
 3 4 5 5 5  
 2 3 4 5 5  
 1 2 3 4 5

Pattern 27:- Numeric Tringal Pattern Program in java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern27  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   int k = 1;  
13:   System.out.println("** Printing the pattern... **");  
14:   for (int i = 1; i <= rows; i++)  
15:   {  
16:   k=i;  
17:   for (int j = 1; j <= i; j++)  
18:   {  
19:   System.out.print(k + " ");  
20:   k = k + rows - j;  
21:   }  
22:   System.out.println();  
23:   }  
24:   }  
25:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 2 6  
 3 7 10  
 4 8 11 13  
 5 9 12 14 15

Pattern 28:- Right Pascal's Triangle With Adding Double Value Pattern Program in java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern28  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   int temp = 1;  
14:   for(int i=1; i<=rows/2+1; i++)  
15:   {  
16:   for(int j=1;j<=i;j++)  
17:   {  
18:   System.out.print(temp*j+" ");  
19:   }  
20:   System.out.println();  
21:   temp++;  
22:   }  
23:   for(int i=1; i<=rows/2; i++)  
24:   {  
25:   for(int j=1;j<=rows/2+1-i;j++)  
26:   {  
27:   System.out.print(temp*j+" ");  
28:   }  
29:   System.out.println();  
30:   temp++;  
31:   }  
32:   }  
33:  }

Output:-

 Enter the number of rows to print the pattern  
 7  
 ** Printing the pattern... **  
 1  
 2 4  
 3 6 9  
 4 8 12 16  
 5 10 15  
 6 12  
 7

Pattern 29:- Zic-Zake Values Triangle Pattern Program in java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern29  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 0; i < rows; i++)  
14:   {  
15:   for (int j = 0; j <= i; j++)  
16:   {  
17:   if (j % 2 == 0)  
18:   {  
19:   System.out.print(1 + j * rows - (j - 1) * j / 2 + i - j +  
20:  " ");  
21:   } else  
22:   {  
23:   System.out.print(1 + j * rows - (j - 1) * j / 2 + rows -  
24:  1 - i + " ");  
25:   }  
26:   }  
27:   System.out.println();  
28:   }  
29:   }  
30:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1  
 2 9  
 3 8 10  
 4 7 11 14  
 5 6 12 13 15

Pattern 30:- Square Rectangle Pattern Program in java.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern30  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   System.out.println("** Printing the pattern... **");  
13:   for (int i = 0; i < rows; i++)  
14:   {  
15:   for (int j = 0; j < rows; j++)  
16:   {  
17:   if (j % 2 == 0)  
18:   System.out.print((rows * (j)) + i + 1 + " ");  
19:   else  
20:   System.out.print((rows * (j + 1)) - i + " ");  
21:   }  
22:   System.out.print("\n");  
23:   }  
24:   }  
25:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 1 10 11 20 21  
 2 9 12 19 22  
 3 8 13 18 23  
 4 7 14 17 24  
 5 6 15 16 25

Pattern 31:- Rectangle Program.

1:  package com.javainterviewpoint;  
2:  import java.util.Scanner;  
3:  public class Pattern31  
4:  {  
5:   public static void main(String[] args)  
6:   {  
7:   // Create a new Scanner object  
8:   Scanner scanner = new Scanner(System.in);  
9:   // Get the number of rows from the user  
10:   System.out.println("Enter the number of rows to print the pattern ");  
11:   int rows = scanner.nextInt();  
12:   int temp = 0;  
13:   System.out.println("** Printing the pattern... **");  
14:   for (int i = rows; i >= 1; i--)  
15:   {  
16:   for (int j = rows ; j >= i; j--)  
17:   {  
18:   System.out.print(j + " ");  
19:   temp =j;  
20:   }  
21:   for (int k = rows - i+1; k < rows; k++)  
22:   {  
23:   System.out.print(temp + " ");  
24:   }  
25:   System.out.println();  
26:   }  
27:   }  
28:  }

Output:-

 Enter the number of rows to print the pattern  
 5  
 ** Printing the pattern... **  
 5 5 5 5 5  
 5 4 4 4 4  
 5 4 3 3 3  
 5 4 3 2 2  
 5 4 3 2 1

Admin Words:- I am tried to solve all these java pattern programs in a simple way. This list helps you to make it easy to understand every design pattern program in java.
If you find any error in this java pattern program. please feel free to ask in the comment below of this post.

Recommended:-

How to Count Number of Bits set Java Program with Example?

2020-08-28T11:02:00.000+05:30

Dear readers, In this article. we are learning about How to count number of bits in java. I went to tell you before understand the code. in this code, we need to know our code format.

In this program. we are using a static method, import Scanner class (to get the input from the user). while Loop, main method, and println method for java.

Suggestion:- What are Methods in Java?

Code of Count number of bits:-

 1: Import java.util.Scanner;   
 2: public class SetedNo {   
 3:   static int countbits(int n){   //Creating static method
 4:    int count=0;   //take a variable to store value
 5:      while(n>0){   //use while loop
 6:       if(n%2==1){   //use "if" to check the end digit
 7:       count++;   //incrementing by 1
 8:     }   
 9:      n=n/2;   //to check value is equal to "n"
 10:     }   
 11:     return count;   //returning count value after break the loop
 12:     }   
 13:    public static void main(String[] args) {   //main method
 14:       Scanner sc=new Scanner(System.in);   //import Scanner class
 15:       System.out.println("enter the no");   //takeing input from the user
 16:       int n=sc.nextInt();   //user number in the form of integer
 17:       int m=countbits(n);   //putting the static method in the variable
 18:       System.out.println("no of bits "+m);   //printing result
 19:      }   
 20: }

The output of our Program:-

1:  enter the no   
2:  Taking input from the user 7   
3:  The no of bits is:- 3

What is bits in java:-

In the programming language have lots of operators. but in our program, we are using bitwise operators. java language performs based on bits and bytes number forms which are always present in the form of Binary numbers("0" and "1").

And always remember byte contains 8 bits. whose bit pattern is "00000000" would change its pattern to "11111111" numbers. and humans can't understand this type of code. because its a machinery language that can understand the only machines.

For Example:- let's suppose we have an integer number int n=13.
and the binary form of this number is "1101" which means 11 contains 2 set bit and 1 is 1 set bit. this combination will be making 3 set bits of data.

Let's understand with the help of Digram:-

Now observe digram. how binary numbers create a set of bits after the compilation process of code. I hope this diagram makes it easy to understand the code. how are bytes and bits works in any programming language. if you are still getting any confusion then you can ask without hesitation in the comment box.

Let's break the code and understand some important and basic points:-

First of all, we create a class.
after then create a static method.
take a variable "int count=0" to store the Loops values.
after then we use "while Loop".
then we are using "if" to count the value of "n".
using the main method in line no.13.
import Scanner class to get input from the user.
also, create a variable (int m) to get the input from the static method.
and print the result with println method.

Suggestion:- 500+ Java Programs List With Examples and Output.

Admin Words:- I am always tried to solve this program in a simple way. Which helps you to make it easy to understand? I hope, now you can understand How to count the number of bits. If you find any error in this program please remind us to comment below of this post.

Next Program:- Check the number is even or odd without modulus?

Recommended: -

What is Variables and Types of Variables in java?

2020-08-22T15:27:00.000+05:30

Variables and Types of Variables in java?

Definition:- Variables are Identifiers that help to store the Data.

Types of Variables in Java.:-

1. Global Variable
• Static Variable/class Variable.
• Non-static Variable / Instance variable.
2. Local Variable

What is Global Variable:-

A Global variable is a variable which is declared directly within the class, outside the method or constructor.

If the Global variable is static, then it is called a class variable.
If the Global variable is non-static, then it is called the Instance variable.

◾Example of Global Variable :

1:  public class Student {  
2:     String name; // Global variable  
3:     double perc=87.64; // Global variable  
4:     static String institute="Spiders";//Global Var  
5:   void study() {  
6:      double noOfHours=5.5;// Local Variable  
7:  }  
8:  }

Must Read:- What should you need to know before learning java?

What is Instance Variable:-

A non-static Global variable is called Instance Variable.
Instance Variable is created in memory only when an object gets created.
The number of copies of each instance variable depends on the number of objects.
Instance Variable is stored inside an Object as a part of Heap memory.

If Instance variable is not initialized at the time of declaration then it is initialized to a default value at the time of Object creation.

◾Example of Instant Variable :

1:  class Shop {  
2:      long contact;  
3:      String addr;  
4:   public static void main(String[] args)  
5:  {  
6:       Shop s1 = new Shop();  
7:       Shop s2 = new Shop();  
8:       s2.contact=455644464L;  
9:       s2.addr="Delhi";  
10:      Shop s3 = new Shop();  
11:      s3.contact=1543265563L;  
12:      s3.addr="New_Delhi";  
13:  }  
14:  }

One More for better understanding:-

1:  public class Tree {  
2:  String type="Potato";  
3:  double height;  
4:  boolean giveFruit=false;  
5:  }

Must Read:- What is ClassLoading in java?

Scope of Instance Variable:

An Instance Variable can be accessed throughout the class and also can be accessed outside the class.
An Instance Variable can be accessed within the same class by using this keyword.
Instance variable can be accessed outside class using Object reference

◾Example:-

1:  public class Car {  
2:       String model="Bmw";  
3:       void start() {  
4:       System.out.println(this.model);  
5:    }  
6:    void move() {  
7:       System.out.println(this.model);  
8:       }  
9:  }  
10: public class Driver {  
11:     void drive() {  
12:         Car c=new Car();  
13:         System.out.println(c.model);  
14:    }  
15:  }

What is Static Variable in Java:- A static variable is common to all the instances (or objects) of the class because it is a class-level variable. In other words, you can say that only a single copy of the static variable is created and shared among all the instances of the class. Memory allocation for such variables only happens once when the class is loaded in the memory.

Syntax of Static variable:-

1:     static keyword followed by data type, followed by a variable name.  
2:     static data_type variable_name;

mentioned above that the static variables are shared among all the instances of the class, they are
useful when we need to do memory management. In some cases we want to have a common value
for all the instances like global variable then it is much better to declare them static as this can save
memory (because the only single copy is created for static variables).

◾Example:-

1:  public class Demo {  
2:      static int count=0;  
3:    public void increment()  
4:    {  
5:       count++;  
6:    }  
7:    public static void main(String args[])  
8:  {  
9:          Demo obj1=new Demo();  
10:         Demo obj2=new Demo();  
11:         obj1.increment();  
12:         obj2.increment();  
13:         System.out.println("Obj1: count is="+obj1.count);  
14:         System.out.println("Obj2: count is="+obj2.count);  
15:  }  
16:  }

◾Output:-

 Obj1: count is=2  
 Obj2: count is=2

Note:- As you can see in the above example that both the objects are sharing the same copy of a static variable that’s why they displayed the same value of count.

Static Variable can be accessed directly in a static method:-

◾Example:-

1:  public class Demo {  
2:      static int age;  
3:      static String name;  
4:     //This is a Static Method  
5:    static void disp(){  
6:       System.out.println("Age is: "+age);  
7:      System.out.println("Name is: "+name);  
8:  }  
9:    // This is also a static method  
10:    public static void main(String args[])  
11:  {  
12:         age = 20;  
13:         name = "Rose";  
14:         disp();  
15:  }  
16:  }

◾Output:-

 Age is: 30  
 Name is: Rose

Static variable initialization:-

Static variables are initialized when class is loaded.
Static variables are initialized before any object of that class is created.
Static variables are initialized before any static method of the class executes.

Default values for static and non-static variables are the same.
primitive integers(long, short, etc): 0
primitive floating points(float, double): 0.0
boolean: false
object references: null

What is Local Variable In java:-

A local variable is a variable that is created within a method or constructor or block.
Local variables must be initialized before use. I .e.., Default initialization is not applicable for a local variable.
The scope of the local Variable is Limited.
Local variable cannot be accessed using Object reference or by using this keyword.

Must Read:- Top 500 Java Programs List With Examples and Output For Beginner to Advance Level in-2020

What is THIS Keyword In java With Examples? || (this) Keyword In java With explanation

2020-05-28T03:05:00.000+05:30

THIS Keyword in Java:-

this is a Keyword which refers to current invoking Object. this keyword is used to access the instance variable and instance methods. a keyword cannot be used within the static context.

I.e.., this keyword cannot be written within a static method or static block.

There are some various usages of 'THIS' keyword in Java are as follows:-

It can be used to invoke or initiate a current class constructor.

It can be passed as an argument in the method calling.

It can be passed as an argument in the constructor call.

It can be used to return the current class instance.

◾Examples (1) :

1:  public class Animal {   
2:     void makeNoise() {   
3:        System.out.println(this);   
4:     }   
5:     public static void main(String[] args) {   
6:        Animal an=new Animal();   
7:        System.out.println(an);   
8:        an.makeNoise();   
9:     }   
10:   }

Before Compilation of program lets's understand the Structure of Our Program Line by Line:-

Class: class Animal.
Creating Method: make noise.
Creating the Main Method.
Creating an Object Of Animal.
Calling or invoking make noise method with the help of object reference (an).

Let's compile and run the code

◾Examples (2):

 public class Person {  
      String name="Tom";  
      void eat() {  
           this.washHands();//(washHands) Method Calling  
           this.serveFood();//(serveFood) Method Calling  
           System.out.println("Tom eat food");  
           this.washHands();//again (washHands) Method Calling  
      }  
      void washHands() {  
           System.out.println("Tom Wash your hands");  
      }  
      void serveFood() {  
           System.out.println("Tom Serve food");  
      }  
      public static void main(String[] args) {  
           Person pe=new Person();  
           pe.eat(); // Method Calling or invoking  
      }  
 }

Let's compile and run the code

◾Examples (3):

 public class Product {  
      int price=20;  
      void printProductDetails() {  
           System.out.println("Product price ="+this.price+" "+"bucks");  
      }  
      public static void main(String[] args) {  
           Product pro=new Product();  
           pro.printProductDetails();  
      }  
 }

Let's compile and run the code

What is ClassLoading in java? || Java Classloader || Basics of Java class loaders.

2020-05-22T04:18:00.000+05:30

What is ClassLoading in java:-

ClassLoading in Java is the process of loading the .class file (Byte Code) from Hard disk memory to JVM Memory. A class gets loaded only once. JVM uses ClassLoader to load the .class file.

Example 1:-

1:  class Project{  
2:       void display() {  
3:            System.out.println("Project display");  
4:       }  
5:       public static void main(String[] args) {  
6:            System.out.println("Main Start");  
7:            Project p1=new Project();  
8:            p1.display();  
9:            System.out.println("Main end");  
10:       }  
11:  }

Here 3 Steps takes place:-

Compilation
ClassLoading
Execution

Program Flow Line by Line:-

5. (main method )

9. Print Message
10. Terminate.

Example 2:-

1:  class Project{  
2:       void display() {  
3:            System.out.println("Project display");  
4:       }

and

1:  public class Demo{  
2:       public static void main(String[] args) {  
3:            System.out.println("Main Start");  
4:            Project p1=new Project();  
5:            p1.display();  
6:            p1.display();  
7:            System.out.println("Main end");  
8:       }  
9:  }

Program Flow Line by Line:-

1:  public class Test {  
2:       public static void main(String[] args) {  
3:            System.out.println(10+10);  
4:            System.out.println("D"+"Demo");  
5:            System.out.println(10+3+"Demo");  
6:            System.out.println(10+10+"Demo"+10+20);  
7:       }  
8:  }

What are Methods in Java? || Instance Method in java.

2020-05-17T02:13:00.000+05:30

INSTANCE METHOD

📝What are Methods in Java: -

A method is a collection of statements that perform some specific task and return the result to the caller.
A method can perform some specific task without returning anything. Methods allow us to reuse the code without retyping the code.
In Java, every method must be part of some class which is different from languages like C, C++, and Python.
Methods are time savers and help us to reuse the code without retyping the code.

◾Syntax of Method in java:

 return_type MethodName ()   
 {   
   // Body of the Method/logic/implementation return statement;   
 }

◾Examples (1):

 class Dog{  
      void run()  
      {  
           //Body of the Method/logic/implementation (better word)  
      }  
 }  
📢// Return Nothing Because Void doesn't have any return type

◾Examples (2):

 class Tap{  
      Water open()  
      {  
           //Body of the Method/logic/Implementation  
           return statement;  
      }  
 }  
 class water{  
 }  
📢//Return "Water"

◾Examples (3):

 class Conductor{  
      Ticket issue() {  
           //Body of Method/logic/Implementation  
      }  
 }  
 class Ticket{  
 }  
📢//Returns "Ticket"

◾Examples (4):

 class Shop{  
      Product sell() {  
           //Body of the Method/logic/Implementation  
           return statement;  
      }  
 }  
 class Product{  
 }  
📢//Returns "Product"

📝Rules for Methods in java:-

Methods must have either return type or void but not both.
Void method cannot return any data.
A method can have only one return type or only one return statement.
The return type of method and the returning value must match.
Inside a method, the return statement must be the last executable statement in java.

Return type means the data type of returning the value.

◾Examples (1):

◾Examples (2):

◾Examples (3):

◾Examples (4):

◾Examples (5):

Here ‘t’ is called a local reference variable.

◾Examples (6):

◾Examples (7):

◾Examples (8):

A Method gets executed only when we invoke it.
A Method can be invoked multiple times.
The main method is not required for compilation rather required for execution.

◾Examples (9):

◾Examples (10):

◾Examples (11):

📢Next Topic:

Data Types in Java || Primitive and Non-Primitive Data Types in Java

2020-05-16T16:56:00.000+05:30

📝Data Types in Java:-

Data types specify the different sizes and values that can be stored in the variable.

✔There are two types of data types in Java:-

Primitive data types: The primitive data types include boolean, char, byte, short, int, long, float, and double.
Non-primitive data types: The non-primitive data types include Classes, Interfaces, and Arrays.

📝Primitive Data Types in Java:-

In Java language, primitive data types are the building blocks of data manipulation. These are the most basic data types available in the Java language.

✔There are 8 types of primitive data types:-

Boolean data type
byte data type
char data type
short data type
int data type
long data type
float data type
double data type

◾Boolean Data Type:

The Boolean data type is used to store only two possible values: true and false. This data type is used for simple flags that track true/false conditions.
The Boolean data type specifies one bit of information, but its "size" can't be defined precisely.

Example: Boolean one = false.

◾Byte Data Type:

The byte data type is an example of a primitive data type. It is an 8-bit signed two's complement integer.
Its value-range lies between -128 to 127 (inclusive). Its minimum value is -128 and the maximum value is 127. Its default value is 0.
The byte data type is used to save memory in large arrays where the memory savings is most required.
It saves space because a byte is 4 times smaller than an integer. It can also be used in place of the "int" data type.

Example: byte a = 10, byte b = -20

◾Short Data Type:

The short data type is a 16-bit signed two's complement integer.
Its value-range lies between 32,768 to 32,767 (inclusive). Its minimum value is -32,768 and the maximum value is 32,767. Its default value is 0.
The short data type can also be used to save memory just like a byte data type.
A short data type is 2 times smaller than an integer.

Example: short s = 10000, short r = -5000

◾Int Data Type:

The int data type is a 32-bit signed two's complement integer.
Its value-range lies between - 2,147,483,648 (-2^31) to 2,147,483,647 (2^31 -1) (inclusive). Its minimum value is - 2,147,483,648 and maximum value is 2,147,483,647. Its default value is 0.
The int data type is generally used as a default data type for integral values unless if there is no problem with memory.

Example: int a = 100000, int b = -200000

◾Long Data Type:

The long data type is a 64-bit two's complement integer.
Its value-range lies between 9,223,372,036,854,775,808(-2^63) to 9,223,372,036,854,775,807(2^63 -1)(inclusive).
Its minimum value is - 9,223,372,036,854,775,808 and maximum value is 9,223,372,036,854,775,807. Its default value is 0.
The long data type is used when you need a range of values more than those provided by int.

Example: long a = 100000L, long b = -200000L

◾Float Data Type:

The float data type is a single-precision 32-bit IEEE 754 floating-point.
Its value range is unlimited.
It is recommended to use a float (instead of double). if you need to save memory in large arrays of floating-point numbers. The float data type should never be used for precise values, such as currency. Its default value is 0.0F.

Example: float f1 = 234.5f

◾Double Data Type:

The double data type is a double-precision 64-bit IEEE 754 floating-point.
Its value range is unlimited.
The double data type is generally used for decimal values just like float.
The double data type also should never be used for precise values, such as currency. Its default value is 0.0d.

Example: double d1 = 12.3

◾Char Data Type:

The char data type is a single 16-bit Unicode character.
Its value-range lies between "\u0000" (or 0) to "\uffff" (or 65,535 inclusive).
The char data type is used to store characters.

Example: char letterA = 'A'

✔Range of primitive data types in java:-

A primitive variable cannot store Object address, only a non-primitive variable can store Object address.

📝Non-Primitive Datatypes in java:-

Non-Primitive data types refer to objects and hence they are called reference types. Examples of non-primitive types include Strings, Arrays, Classes, Interface.

◾Strings:

Strings are a sequence of characters. But in Java, a string is an object that represents a sequence of characters. The java.lang.String class is used to create a string object.
If you wish to know more about Java Strings, you can refer to this article on Strings in Java.

◾Arrays:

Arrays in Java are homogeneous data structures implemented in Java as objects.
Arrays store one or more values of a specific data type and provide indexed access to store the same.
A specific element in an array is accessed by its index.
If you wish to learn Arrays in detail, then kindly check out this article on Java Arrays.

◾Classes:

A class in Java is a blueprint which includes all your data.
A class contains fields(variables) and methods to describe the behavior of an object.

◾Interface:

Like a class, an interface can have methods and variables, but the methods declared in interface are by default abstract (only method signature, No body).

Example:

Here Bike is a non-primitive data type.

📢Next Topic:

What is Class & Objects In JAVA || Class and Objects in oops

2020-05-10T19:00:00.001+05:30

Classes and Objects In Java

📝What is 'Class' in Java? :

A Class is a Logical entity or Blueprint using which we can create multiple Objects.
We cannot create an Object without a Class. Hence Step.1 create a class and then create any number of objects.
Multiple Objects created using the same class are called as Similar Object or Identical Object.
Every Object work independently, I.e.., if one Object is modified or destroyed then it does not affect another Object.

📝What is 'Object' in java? :

An object is a Real-world Physical entity.
Anything which has Physical presence or Physical appearance can be considered as an Object.

🌟Object Contains two Important things Or Properties:-

States
Behavior

After successful compilation, the compiler generates default Constructor. Where the constructor name must be the same as a class name.

Example:

🎖Some Important Points Of Object:-

In java, Objects are stored in Heap Memory. Memory allocation & Memory deallocation i.e, complete Memory management is taken care by JVM.
Jvm creates an object in heap Memory when we call the Constructor using a "new" Keyword.
Object address is represented in Hexa Decimal format.
The Class name and object name must be the same.
This address is started in a variable called a reference variable, which helps in accessing the data present in the Object.

Best telegram channel of shopping offers?

🎖How To Create Object in java, and how it's Stored In Memory:-

Example(1):

Example(2):

🌟Object Reference / Object Address :

A Reference is the one which stores an Object address, Hence Object Reference is present in Heap Memory.

Example:

🌟what Are the States of an object:

The State of an object is nothing but the property/information or data which describes an Object.
The data member is nothing but a data holder, which holds / stores the data.

States:- It is always representing features of an Object.

Behavior:- It always represents the Action performed by an Object.

📎There are 2 types of Data Member:
➢ Variable.
➢ Constant.

In the case of Variable, the data Varies I.e.., the data Changes.
Programmatically non-final data members are called Variable.
Constant is the data member which represents Fixed Value.
Programmatically we declare Constant using Final Keyword.

Example:

final name = “Dog” ; → Constant.

name = “ Tommy” ; → Variable.

Since an Object is derived from a class, the States & Behaviors of an Object must be first declared in class, Hence States & Behaviors are contents of the class.

Example:

➢Object Creation & Direct Initialization:

➢Object Creation & Initialization using Object Reference

📢Next Topic:- Learn more about class and objects in java

Java Compilation Process | WORA Architecture | What is JDK, JVM, JRE?

2020-05-10T07:00:00.001+05:30

Java Compilation Process, WORA Architecture, What is JDK, JVM, JRE?

📝What is Java Compilation: Java Compilation is a 2 step process.

I. Check the Syntax of Java program.
II. If the Program is Syntactically correct Byte code gets generated.

📌Note: If a program is Syntactically wrong the compiler doesn’t generate Byte code but rather throws Error.

📝WORA Architecture:

Java program and Java Application can run on any different platform, Provided the platform must have JVM. After successful compilation, the Byte code is generated.
Java applications are called WORA (Write Once Run Anywhere). This means a programmer can develop Java code on one system and can expect it to run on any other Java-enabled system without any adjustment. This is all possible because of JVM.
In traditional programming languages like C, C++ when programs were compiled, they used to be converted into the code understood by the particular underlying hardware, so If we try to run the same code at another machine with different hardware, which understands different code will cause an error, so you have to re-compile the code to be understood by the new hardware.
In Java, the program is not converted to code directly understood by Hardware, rather it is converted to bytecode(.class file), which is interpreted by JVM, so once compiled it generates bytecode file, which can be run anywhere (any machine) which has JVM( Java Virtual Machine) and hence it gets the nature of Write Once and Run Anywhere.

✔What is JVM? :

JVM (Java Virtual Machine) is an abstract machine. It is called a virtual machine because it doesn't physically exist. It is a specification that provides a runtime environment in which Java bytecode can be executed. It can also run those programs which are written in other languages and compiled to Java bytecode.
JVMs are available for many hardware and software platforms. JVM, JRE, and JDK are platform dependent because the configuration of each OS is different from each other. However, Java is platform-independent. There are three notions of the JVM: specification, implementation, and instance.

🌟The JVM performs the following main tasks:

Loads code
Verifies code
Executes code
Provides runtime environment

✔What is JRE? :

JRE is an acronym for Java Runtime Environment. It is also written as Java RTE. The Java Runtime Environment is a set of software tools that are used for developing Java applications. It is used to provide a runtime environment. It is the implementation of JVM. It physically exists. It contains a set of libraries + other files that JVM uses at runtime.
The implementation of JVM is also actively released by other companies besides Sun MicroSystems.

✔What is JDK? :

JDK is an acronym for Java Development Kit. The Java Development Kit (JDK) is a software development environment that is used to develop Java applications and applets. It physically exists. It contains JRE + development tools.

🌟JDK is an implementation of any one of the below given Java Platforms released by Oracle Corporation:

Standard Edition Java Platform
Enterprise Edition Java Platform
Micro Edition Java Platform

🌟The JDK contains a private Java Virtual Machine (JVM) and a few other resources such as an interpreter/loader (java), a compiler (javac), an archiver (jar), a documentation generator (Javadoc), etc. to complete the development of a Java Application.

🌟Difference between JDK, JRE, and JVM:

Here are some major differences between JDK vs. JRE vs. JVM:

JDK	JRE	JVM
The full form of JDK is the Java Development Kit.	The full form of JRE is Java Runtime Environment.	The full form of JVM is Java Virtual Machine.
JDK is a software development kit to develop applications in Java.	It is a software bundle that provides Java class libraries with necessary components to run Java code.	JVM executes Java byte code and provides an environment for executing it.
JDK is platform dependent.	JRE is also platform dependent.	JVM is platform-independent.
It contains tools for developing, debugging, and monitoring java code.	It contains class libraries and other supporting files that JVM requires to execute the program.	Software development tools are not included in JVM.
It is the superset of JRE	It is the subset of JDK.	JVM is a subset of JRE.
The JDK enables developers to create Java programs that can be executed and run by the JRE and JVM.	The JRE is part of Java that creates the JVM.	It is the Java platform component that executes source code.
JDK comes with the installer.	JRE only contains the environment to execute source code.	JVM bundled in both software JDK and JRE.

📢Next Topic:

What is Orientation, Association, Aggregation and Composition in java

2020-05-09T19:00:00.000+05:30

Hello Dear Reder, In this article, we are discussing what is Orientation, Association, Aggregation as well as Composition in Java Language. I will try to give some Real-world Examples which makes it easy to understand for you.

Orientation, Association, Aggregation and Composition in Java

📝Orientation: Seeing or pursue everything around as an object. is called as object-orientation.

java sees everything around its self as an object. hance it is an object-oriented programming language.

📝Association ( Has – A Relationship ): Association is one of the concepts of Object Orientation which is also called as Has–A Relationship.

It is a process of one or many Objects getting associated with another Object.

✔There are 2 forms of Association :

I. Composition.
II. Aggregation.

📝Composition: A composition is a special form of association. where an associated Object can not logically independently exists on its own without Owner Object.

If Owner Object is destroyed. then the associated object is also destroyed. Hence it is called Strong Has – A Relationship.

Example of Composition: Plant and Leaves.

The plant is a whole and Leaves are parts. If the plant is destroyed. then all corresponding Leaves for that Plant should be destroyed.

One More Example: Human and Heart.

📝Aggregation: An aggregation is a special form of association. where an associated Object can logically independently exist even without the Owner Object.

If Owner Object is destroyed still an associated Object can exist. Hence it is called Weak Has – A Relationship.

Example of Aggregation: Driver and Car.

If Driver Object is destroyed it will not affect Car Object and Vise-Versa.

Example (2): Employee and company.

Admin Words:- Hopefully, now you can understand Orientation, Association, Aggregation, and Composition. if you still confused then please remind us to comment below of this post I will try to make it more easy for you. And stay away to learn programs J with Us. and also Read our Next Program.

📢Next Topic: Java Compilation Process | WORA Architecture | What is JDK, JVM, JRE?

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Write a Java Program to check User Enter Number is Even Or Odd?

Write a Java Program To Check User Enter Number is Even Or Not Without Modulus Operator?

Write a Java Program Without Using " if " Check User Entered Number is Even OR odd?

Basic java introduction for beginners in Detail

2020-05-09T01:42:00.001+05:30

Hello Dear reader, in this article I will tell you some basic important basic points of java. What is java? every new Student has this common question, but after reading this article your all doubts are clear regarding java.

What is Java?

# java introduction for beginners

1). Java is an object-oriented Programming language similar to C++, but with advanced and simplified features. Java is free to access and can run on all platforms.

2). (WORA) Java is a write-once, run-anywhere programming language wHICH IS developed by Sun Microsystems. It is similar to C and C++ but a lot easier. You can combine Java with a lot of technologies like Spring, node js, Android, Hadoop, J2EE, etc… to build robust, scalable, portable, and distributed fullfledged applications. Java also promotes continuous integration and testing using tools like Selenium.

3). Java was originally developed by James Gosling with his colleagues at Sun Microsystems during the early 1990s. Initially, it was called a project ‘Oak’ which had implementation similar to C and C++. The name Java has later selected after enough brainstorming and is based on the name of an espresso bean. Java 1.0, the first version was released in 1995 with the tagline of ‘write once, run anywhere’. Later, Sun Microsystems was acquired by Oracle. From there, there has been no looking back. The latest version of Java is Java 12 released in March 2019.

4). Oracle Corporation is the current owner of the official implementation of the Java SE platform, following its acquisition of Sun Microsystems on January 27, 2010. This implementation is based on the original implementation of Java by Sun. The Oracle implementation is available for Microsoft Windows, Mac OS X, Linux, and Solaris.

Features of Java?

Simple: Java has made life easier by removing all the complexities such as pointers, operator overloading as you see in C++ or any other programming language.
Portable: Java is platform-independent which means that any application written on one platform can be easily ported to another platform.
Object-oriented: Everything is considered to be an “object” which possesses some state, behavior and all the operations are performed using these objects.
Dynamic: It has the ability to adapt to an evolving environment that supports dynamic memory allocation due to which memory wastage is reduced and the performance of the application is increased.
Robust: Java has a strong memory management system. It helps in eliminating errors as it checks the code during compile and runtime.
Interpreted: Java is compiled to bytecodes, which are interpreted by a Java run-time environment (JRE).
Multithreaded: The Java platform is designed with multithreading capabilities built into the language. That means you can build applications with many concurrent threads of activity, resulting in highly interactive and responsive applications.
Platform Independent: Java code is compiled into an intermediate format (bytecode), which can be executed on any systems for which Java virtual machine is ported. That means you can write a Java program once and run it on Windows, Mac, Linux, or Solaris without re-compiling. Thus the slogan “Write once, run anywhere” of Java.
Secure: The Java platform is designed with security features built into the language and runtime system such as static type-checking at compile time and runtime checking (security manager), which lets you create applications that can’t be invaded from outside.

(#java introduction for beginners)

Suggestion:- 500+ Java Programs List With Examples and Output.

Admin Words:- Hopefully, now you can understand Basic java introduction for beginners. And stay away to learn Java J with Us. and also Read our Next Program.

📢Next Topic: Orientation, Association, Aggregation, and Composition in Java?

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Top 10 Highest Paying Jobs that you Should Look Out for in the Year of (2020)

2020-04-02T01:46:00.002+05:30

Top 10 Highest Paying Jobs that you Should Look Out for in the Year of 2020:-

According to Gartner. The Tech Industry is the top of the employment pyramid. With some of the highest paying career options. And there is no secret, that one of the biggest factors that influencers our career choice is salary. Now with the year 2020. Writer on the corner this might is the best time for you to plan your career and future proof by making. That they will never be a hole in your pocket with the career you choose. So keep that in mind, in this article. We discuss the top 10 highest paying jobs in 2020.

10.full stack developer:-

A full-stack developer is an IT professional. Who works on the front-end as well as on the back-end of applications. The average salary of a full-stack developer is $110,000 to $150,000 per year.

The Skillet required to become a full-stack developer. Includes experience in working with.

web technologies:- HTML, CSS, JavaScript, ReactJs.
Spring Boot
NodeJs
frameworks
Flask
Bootstrap
jQuery
Ruby on Rails
GraphQL
Any programming knowledge: for example Python, Java, Angular.
experience with database systems. for example:- MySQL, Oracle Database, Django
an experience that servers for example Apache.

9. RPA developer:-

an RPA developer includes automatic repetitive and monotonous tasks in an organization. in other words. RPA developers are responsible for automating business processes using coding and Programming Languages. the average salary of an RPA developer is $85,000 to $130,000 per year. The Skillset required to become an RPA developer includes significant experience in

knowledge on leading automation tools, e.g., Blue Prism and UiPath

Excellent software development background, e.g C#, C++, Java, .NET

Basic programming knowledge on HTML, JavaScript (or any scripting language)

Experience with Agile development methods.

Experience with Databases (SQL or NoSQL) often preferred

Knowledge of AI and Machine Learning

Understanding of workflow-based logic

Strong attention to detail and analytical skills

Excellent communication skill

Talent to present technical details

8. Python developers:-

Here we already know about this Programming Language. Python is one of the most popular programming languages right now. and Python developers are huge demand in various domains. as a web development automation and so many more things. and the Nodejs is that all these domains are among the highest paying domains. so regardless of the domain. that their working in Python developers will be getting some huge salary. the average salary of a Python developer is $120,000 to $180,000 per year.

The Skillset required to become a Python developer

Core Python

Object-relation mappers

Multi-purpose architecture

Web frameworks

Code packaging, release, and deployment

Design skills

RESTful APIs

Scriptwriting

Good communication skills.

7. IoT Engineer:-

an IoT engineer handles developing practical IoT solutions that solve real-time business problems. now IoT might see new technology. but its applications are widespread. from the idea of living in a smart home that can turn the AC ON before you even reach home to the idea of living in a smart city. where there is no traffic congestion at all. all this can be possible by IoT engineers the average salary of an engineer is $120,000 to $165,400 per year.

The Skills required to become an IoT engineer. include expertise in one of the programming languages. here to you need to know about Python or java Language. also having some knowledge of hardware requirements electronics and Circus clarity on data. and cybersecurity concepts and understanding of IoT applications using H devices and sensors.

6. DevOps Engineer:-

Now if you have been following the recent Technology Trends. you would know that the above has become the heart of software development. processes a DevOps engineer handles smoothing out. the life cycle of a DevOps engineer has to co-ordinate with developers and IT staff as well. the average salary of a DevOps engineer is 124,000 per year.

The Skillset required to become a DevOps engineer. include the understanding of Phoenix fundamentals. sound knowledge of various DevOps tools such as. for Example- CHEF, puppet, Git, and more. good understanding of coding building and testing a software project.

5. data warehouse solutions architect:-

This Is the Biggest Era of ever-growing data. which means that analyzing this data is not are the only problem. we also first to capture and stored somewhere. this is where data warehouse and data warehouse solution architect. The average salary of a data warehouse solutions architect is 130,000 per year.

The Skillset required to become a data warehouse solutions architect. include a good understanding of ETL, Data Modelling, and Data analysis. understanding data systems and applications to create a fault-tolerant system. experience with client-server web-based computing architectures.

4. big data Hadoop developers:-

Big Data Hadoop Developers are other ones. who make it possible for organizations to deal with big data. to understand customer behavior auto understand business Patterns to achieve growth. The average salary of a big data Hadoop developer is one 136,000 per year.

The Skillset required to become a big data Hadoop developer. skill in any Back-End programming language. basic knowledge of the Linux operating system. analytical problem-solving skills basic knowledge of SQL and database structures.

3. cloud engineer:-

"Image" cloud engineer is an IT professional. who takes care of all the technical workload related to Cloud Computing. if you are aware of the current status of cloud computing in the market. you would know that almost every organization is looking for cloud engineering. because almost every organization is moving its infrastructure to Cloud Computing. The average salary of a cloud engineer is $139,000 per year.

The Skillset to become a cloud engineer. include experience with LINUX operating system. understanding of almost any of the cloud computing platform. basic programming knowledge and understanding DevOps.

2. data scientist:-

are the big data ...... who worked with big data. they take over many roles within an organization. example:- data mining data analyzing, data cleansing organizing. and most important extracting valuable information from Data. the average salary of a data scientist is 130,9897 per year.

The Skillset required to become a data scientist. include programming skills in any of the statistical programming languages. like Python or R statistical skills. understanding of big data tools and data visualization tools.

4. artificial intelligence architect:-

an AI architect who handles AI development and management within an organization. and also Delivers AI solutions to the client that they work with. the average salary of an architect Engineer is 144,000 per year.

The Skillset needs to know to become an AI architect. includes you have some knowledge of programming languages. used for statistical computing suggests R and knowledge of a concert. suggest machine learning and deep learning and more. so, guys, these are the top 10 highest paying jobs that you should look out for in the year 2020. but again not everyone's list can be the same. so if you have any other Tech job in your mind that you would like to include in the list of highest-paying jobs.

Check User Enter Number is Even or odd Without Using 'if ' Statement.

2020-03-07T22:07:00.000+05:30

//Qus:- #4. Write a Java Program Without Using 'if ' Check User Entered Number is Even or odd.

Check User Entered Number is Even Or odd without ' If ' Statement?

Solution:-

 import java.util.Scanner;  
 public class Demo {  
      public static void main(String[] args) {  
           Scanner sc = new Scanner(System.in);  
           System.out.println("Enter the number");  
           int n = sc.nextInt();  
           String number=(n%2==0)?"Even":"Odd"; //Using Ternary operator ( ? : )  
           System.out.println(n+" is "+ number);  
      }  
 }

🤖Explanation: let's Suppose User Entered Number is (n=21).

Example 1:- Check User Entered number is even or Odd just applying condition (n%2==0)

if the user entered number is divisible by 2 then it's print Even otherwise prints Odd.

👉 21%2= 1(Reminder)

🤙this number is not satisfied with the condition so it's Print Odd.

Example 2:- let's Suppose User Entered Number is (n=20);

let's check the condition:- (n%2==0)

👉 20%2=0 (Reminder)

🤙User entered number is satisfied the Condition so it's print Even

🤦‍♂️Try Your Self Buddy, If you Get any Error just Comment Below, Definitely, I will try to Solve Your Problem.

Suggestion:- 500+ Java Programs List With Examples and Output.

Admin Words:- I am always tried to solve this program in a simple way. Which helps you to understand easily? Hopefully, now you can understand How to check Even Or odd without ' If ' Statement. If you find any error in this program please remind us to comment below of this post. And stay away to learn programs J with Us. and also Read our Next Program.

Next Program:- Write a Java Program To Check User Enter Number is Even Or Not Without Modulus Operator?

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Write a Java Program to check User Enter Number is Even Or Odd?

Write a Java Program Without Using " if " Check User Entered Number is Even OR odd?

What should you need to know before learning java?-Java Basic Concepts

2020-03-05T12:11:00.000+05:30

Dear reader, in this Article we need to Learn Java Basics Concept Before going on a High Level. which is the most important part of every new Student. every student needs to clear basics because without basics you can't understand any programming language.

if you really want to learn java please keep focus and try to understand the concepts.

Software:- What is Software?

#Ans:- in simple Language Software is a collection of Programs, Which is used to Solve real-world Problems bypassing Instructions to Hardware.

Programming Language:- What is Programming Language?

#Ans:- Any Software Language, which is used to build a program is called a programming language OR any program which is executed by a computer to perform a specific task, mostly all Programs are written by a programmer or Developer, Like- Java, Python, C#, C++, etc.

Program:- What is the Program?

#Ans:- It is a set of instructions given to a hardware machine to solve Human problems. usually written by a Programmer or Developer, we can Call as a Powerful Code.

Platform:- What is PlatForm?

#Ans:- A Platform is a spar or an environment provider to run the programs or a software application, like- Windows, Linx, MacOs, Android, iOS, Unix, etc.

What is Java?

#Ans:- Java is an Object-Oriented Programming Language and it is Also a Platform Independent Language. According to other languages, Java is best known for its Security, with Java, we can Develop Virus-free System.

Why is Java More Secure Language?
#Ans:- Because of, In java, have these following things,

No explicit pointer.
Java programs run inside a virtual machine sandbox.
ClassLoader (in Java it is a part of JRE)
ByteCode Verifier (it is used to checks the code fragments for illegal code that can violate access right to objects)
Security Manager (it determines what resources a class can access such as reading and writing to the local disk)

Some Special Features of Java:-

Java is a Simple Programming Language We can Learn easily.
Object-Oriented Programming Language.
Java is Distributed.
also an Interpreted Language.
Robust.
Secure.
Portable.
Multithreaded.
also have a Garbage Collector(which is Run by JVM automatically)

Object:- What is an Object?

#Ans:- An Object is a real-world entity, it will be a component which can we feel, seeing, and touch. which is Created from the Class, without Class Object Can not Be Created.

Object Contains two Important things Or Properties:-

1. States

2. Behavior

States:- It is always representing features of an Object.

Behavior:- It always represents the Action performed by an Object.

Some Important Points Of Object:-

An object can be created by using a "new" Keyword.
The Class name and object name must be the same.
An object is always created in the Heap Memory.
Inside the heap memory, the Object contains Object name(similar to the class name), address of the Object(in hexaDecimal values), states and behavior of the Object.
This address is started in a variable called a reference variable, which helps in accessing the data present in the Object.

How To Create Object, and how it's Stored In Memory:-

suggestion:- Primitive and Non-Primitive Data Types in Java

Class:- What is Class in java?

#Ans:- A-Class is a Blueprint Design of a Plane using which we can create Multiple Objects.

A Class is the Context Of Java or Template that is used to create objects and to define data types and Methods.

In Java without the Class, we can not create any Object.
Using a Class "n" Number of Objects can be created.
Always the Class name must be in camel case, ex:- "helloworld"(because the first Letter is small)
No Space should be there between in Class name, variable name, method name, Right Way to Write:- Hello_World
We can not start any class name, variable name, method name with numerical, ex:- 3Hello_World.
You can not use any Java Keyword as a Class name, variable name, and Method name.
we can use Some access Modifiers with Class:- public, private, protected, and default and final.

What are Identifiers in java:- Identifiers are the one which helps us in differentiating any two Class in java, (Class name is also an Identifier).

there are some Rules:-

Must be a camel case.
No space in between the Class name.
No special characters but we can use ($ and "_ " underscore).
we can not write the name from numerical.
Can't use Keywords, like- Class, int, new, String, etc.

Suggestion:- 500+ Java Programs List With Examples and Output.

Admin Words:- Hopefully, now you can understand some Java Basics Concept. If you are still confused about any point in this Article please remind us to comment below of this post. And stay away to learn Java J with Us. and also Read our Next Program.

📢Next Topic:- Basic introduction to java programming Language in Detail.

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Write a Java Program To Check User Enter Number is Even Or Not Without Modulus Operator?

2020-03-03T18:38:00.000+05:30

//Qus #3:- Check User Enter Number is Even Or Not Without Modulus Operator?

Solution:-

 import java.util.Scanner;   
 public class Even_Or_Odd {   
      public static void main(String[] args) {   
           Scanner sc= new Scanner(System.in);   
           System.out.println("Enter the number");   
           int n =sc.nextInt();   
           if(n/2*2==n)   
           {   
                System.out.println(n+" User Enter Number Is Even");   
           }   
           else   
           {   
                System.out.println(n+" User Enter Number Is Odd");   
           }   
      }   
 }

🤖Explanation: let's suppose User Entered Number is (n=62)

let's Check The Condition (n/2*2==n)

👉62/2*2=62

👉124/2=62

👉62=62

🤙That's why User Enter Number is Even

🤦‍♂️Try Your Self Buddy, If you Get any Error just Comment Below, Definitely, I will try to Solve Your Problem.

Write a Java Program to check User Enter Number is Even Or Odd?

2020-03-03T17:59:00.000+05:30

//Qus.#2:- check User Enter Number is Even Or Odd?

Solution:-

 import java.util.Scanner;  
 public class Even_Or_Odd {  
      public static void main(String[] args) {  
           Scanner sc= new Scanner(System.in);  
           System.out.println("Enter the number");  
           int n =sc.nextInt();  
           if(n%2==0)  
           {  
                System.out.println(n+" User Enter Number Is Even");  
           }  
           else  
           {  
                System.out.println(n+" User Enter Number Is Odd");  
           }  
      }  
 }

🤖Explanation: let's suppose User Entered Number is (n=22)
👉 n=n%2 (Always Gives Reminder)
👉 n=22%2
👉 reminder = 0

Let's Check the condition (n%2==0)
👉 22%2=0
👉 0=0 ( Condition Satisfied that's why this number is Even)

🤙Note:- If we get 1 Reminder then the number is Odd
If we get 0 Reminder then the number is Even

🤦‍♂️Try Your Self Buddy, If you Get any Error just Comment Below, Definitely, I will try to Solve Your Problem.

Next Program:- #3.Write a Java Program to Check User Enter Number is Special Two-Digit Number OR not?

Check User Enter Number is Special Two Digit Number OR Not?

2020-03-03T15:36:00.000+05:30

In this article, we are trying to solve the user-entered number is a special two digit number or not.

! Important Note:- Before learning Programming you need to know about Java Basic Concepts (click here to learn).

First of all, learn about java Scanner Class in short.

import java.util.Scanner;

A Scanner is a Class of Java.util Package used for Obtaining the Input of Primitive Data Type like -int, double, long, etc.
Scanner Class is the easiest way to Read the input of Java Program.
To Create an Object of Scanner Class, we Usually Pass the Predefine Object (System.in). Which is represent the Standard input stream, we may Pass an Object of Class file. if we want to read from a file.
always Scanner Class Saved with the extension of (Read.java).

nextBoolean( );
nextByte( );
nextShort( );
nextInt( );
nextLong( );
nextFloat( );
nextDouble( );
next( ); //Use for Strings
nextLine( ); // Use for String Sentence\ etc....

//Qus:- Check User Enter Number is Special Two Digit Number OR not?

Solution:-

 import java.util.Scanner;  
 public class Read_Special_Two_Digit_Number_Or_Not {  
      public static void main(String[] args) {  
           Scanner sc= new Scanner(System.in);  
           System.out.println("Enter the Number Is Special Two Digit or Not");  
           int n = sc.nextInt();  
           //n is User Enter Number for Output  
           int a=n/10;  
           int b=n%10;  
           int c=(a+b)+(a*b);  
           // Formula for Modulus  
           if(c==n)  
                //(If( )) is Conditional Statement  
           {  
                System.out.println(n+" "+"Is Special Two Digit Number");  
           }  
           else  
                System.out.println(n+" "+"Is Not a Special Two Digit Number");  
      }  
 }

🤖Explanation: let's Suppose User Entered Number is (n=29)

Finding the 1st Number of Digit:-
👉 a=n/10
👉 a=29/10
👉 a=2

Remember this note:- in java always integer values give integer after division, it means 29/10=2.9 but in java, we write only 2, (not point 9)

Finding the 2nd Number of Digit:-

👉b=n%10 (Always Gives Reminder)
👉b=29%10
👉 reminder = 9

Applying Formula :- n=(a+b)+(a*b)
👉 (2+9)+(2*9) = 29

🤙 that means c=29 so according to condition (c=n) the value of c and n are Equals, that why 29 is a Special Two-Digit Number

🤦‍♂️Try Your Self Buddy, If you Get any Error just message me, Definitely, I will try to Solve Your Problem.

Suggestion:- 500+ Java Programs List With Examples and Output.

Admin Words:- I am always tried to solve this program in a simple way. Which helps you to make it easy to understand? I hope, now you can understand How to find the user enter number is a Special Two Digit Number or not. If you find any error in this program please remind us to comment below of this post.

Next Program:- Check the number is even or odd without modulus?

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Next Program:- #2. Write a Java Program to Check User Enter Number Is Even Or Odd?