tag:blogger.com,1999:blog-8175021190731585116Thu, 14 May 2026 11:45:48 +0000Interview QuestionsWallpapersPhotoshopJSFDo You Know ?Latest NEWZFUN ZoneIBM WebSphere Portal 6.1Free WallpapersIPL T20IBM WebSphere Portal v6.1ExtJSJavascriptSpringGWTJSR 286 PortletsBolywood WallpapersIBM WebSphere Portal 6.0Cricket WorldCupHolywood WallpapersWindows XP HacksBlack is Beautiful WallpapersJSF Portlets Apllicationfree desktop wallpaperJasper ReportsServletsLog4jOrkut themesWCMWebSphere Application Server (WAS)Art WallpapersEJB3How to use EclipseJPAJava ConcurrencyJava SE 6StrutsSubclipsei-PhoneAJAXBest PracticeExceptions and ResolutionsH1N1 Flu (SWIME Flue)JAVA Design PatternsJSPJSRAtoZ Photography WorldFacts N Findingsi-Phone wallpaperCalendar WallpapersGoogle Chrome BrowserHappy BirthdayJUnitMaven POMMyEclipseOpen JPAPUMARailway TimeTableRational Application Developer (RAD)Serials Going Wild3D WallpapersAndroid PhonesAntiVirus BestFestivalGlossary of TermsIBM WebSphere Portal v6.1.5JSTLJavaSE7MACMULERegular ExpressionsSOASQLSTATE valuesTomcatWeb 2.0A to Z - CelebritiesAll about YouApacheContinuumCredential VaultsDAO - Java Access ObjectDB2Dependency InjectionDevotional WallpapersEAIFIFA Worldcup 2010FlexGM Diet PlanGoogle LogosHibernetIBM WebSphere PortaJ2EE Design patternsJPQL APIJQueryJSF OracleJSR 168 PortletsJava Data Objects - JDOJavaFXLOGOLatest NEWZ; FIFA Worldcup 2010Mobile Goodies and NewzMy ArticlesNew Year WallpapersPOI APIPaintingsPicture Gallary EventsSCJP 5.0SQLSitemapSony EricssonSubversionTILES FrameworkUMLUNIXValentines Day WallpapersWASWebServicesXMLXML Job Controller Language (xJCL)http://atoz-tech.blogspot.com/noreply@blogger.com (A to Z Stuff)Blogger727125en-usnonoreply@blogger.comtag:blogger.com,1999:blog-8175021190731585116.post-4842102186760935870Sun, 18 Sep 2016 13:36:00 +00002016-09-18T06:36:39.352-07:00Do You Know ? Enable Developer Option in OnePlus X Step 1: Unlock your phone and go to settings. Step 2: Under Settings, scroll down and open About phone. Step 3: Under About phone, find Build Number and tap seven times on it.  After tapping seven times on it, you will get a message on your screen that you are now a developer. That’s it you have successfully enabled developer option on your http://atoz-tech.blogspot.com/2016/09/solved-usb-debuging-oneplusx-greyed.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-2725053203143148057Thu, 22 Oct 2015 11:54:00 +00002015-10-22T04:54:20.447-07:00 import java.io.*; import java.util.*; public class Sort { public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new FileReader("fileToRead")); Map<String, String> map=new TreeMap<String, String>(); String line=""; while((line=reader.readLine())!=null){ map.put(getField(line),line); http://atoz-tech.blogspot.com/2015/10/sort-file-contents.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-9068296017539255654Thu, 22 Oct 2015 10:47:00 +00002015-10-22T03:47:55.453-07:00Interview Questions Find out square root of a given number without using any built-in functions     public static void findSquareRoot(double number)     {         boolean isPositiveNumber = true;         double g1;         //if the number given http://atoz-tech.blogspot.com/2015/10/programs-asked-in-interviews.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-2655187087016769502Thu, 22 Oct 2015 07:54:00 +00002015-10-22T00:55:16.027-07:00Interview Questions public class BinarySearchTree { public class Node { private int data; private Node leftChild, rightChild; } public static Node mirrorBST(Node node) {   if (node.equals(null)) return(node); // swap children of this node Node tmp; tmp = node.leftChild; node.leftChild = node.rightChild; node.rightChild = tmp; // do the subtrees - RECURSSION if (node.leftChildhttp://atoz-tech.blogspot.com/2015/10/mirror-b-tree.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-3392483408525053735Tue, 06 Oct 2015 18:45:00 +00002015-10-06T11:45:11.350-07:00Interview Questions class StudentFirstNameComparator implements Comparator{    @Override    public int compare(Student o1, Student o2) {        return o1.getFirstName().compareTo(o2.getFirstName());    }} class StudentLastNameComparator implements Comparator{    @Override    public int compare(http://atoz-tech.blogspot.com/2015/10/chain-comparators.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-7516802261822369229Mon, 05 Oct 2015 17:41:00 +00002015-10-06T11:42:08.933-07:00Interview Questions As suggested earlier, the data structure used by ConcurrentHashMap is similar in implementation to that of Hashtable or HashMap, with a resizable array of hash buckets, each consisting of a chain of Map.Entry elements, as shown in Listing 1. Instead of a single collection lock, ConcurrentHashMap uses a fixed pool of locks that form a partition over http://atoz-tech.blogspot.com/2015/10/concurrenthashmap-implementation.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-2585574977911844730Sun, 04 Oct 2015 15:13:00 +00002015-10-04T08:13:02.532-07:00Interview Questions Suppose we have list of four tasks: Task A, Task B, Task C and Task D which perform some complex computation and result into an integer value. These tasks may take random time depending upon various parameters. We can submit these tasks to executor as: ExecutorService executorService = Executors.newFixedThreadPool(4); List futures = new ArrayList>(); futures.add(executorService.submit(A)); http://atoz-tech.blogspot.com/2015/10/executorservice-vs-executorcompletionse.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-6181453930780653099Sun, 04 Oct 2015 15:12:00 +00002015-10-04T08:12:29.544-07:00Interview Questions public interface MyInterface { // In interface method can only be PUBLIC or DEFUALT public void methpublic(); void methDefualt(); // In interface method CAN NOT BE private Static Protected //private void methprivate(); //static void methstatic(); //protected void methprotected(); } http://atoz-tech.blogspot.com/2015/10/interface-method-declarations.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-2204702428799447048Sun, 04 Oct 2015 15:09:00 +00002015-10-04T08:09:36.549-07:00Interview Questions http://atoz-tech.blogspot.com/2015/10/mergesort-collectionssort-uses-tim-sort.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-8851284643194613939Sun, 04 Oct 2015 05:55:00 +00002015-10-03T22:55:40.124-07:00Interview Questions The main reason that nulls aren't allowed in ConcurrentMaps (ConcurrentHashMaps, ConcurrentSkipListMaps) is that ambiguities that may be just barely tolerable in non-concurrent maps can't be accommodated. The main one is that if map.get(key) returns null, you can't detect whether the key explicitly maps to null vs the key isn't mapped. In a non-concurrent map, you can check this via http://atoz-tech.blogspot.com/2015/10/why-concurrenthashmap-does-not-allow.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-1253109759701978920Sun, 04 Oct 2015 03:47:00 +00002015-10-03T20:47:58.894-07:00Interview Questions Lazy initialization public class SingletonDemo { private static volatile SingletonDemo instance; private SingletonDemo() { } public static SingletonDemo getInstance() { if (instance == null ) { synchronized (SingletonDemo.class) { if (instance == null) { instance = new SingletonDemo(); } } }http://atoz-tech.blogspot.com/2015/10/singleton.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-5973415227218177703Sat, 03 Oct 2015 15:19:00 +00002015-10-03T09:01:47.685-07:00Interview Questions A task queued with execute() that generates some Throwable will cause the UncaughtExceptionHandler for the Thread running the task to be invoked. The default UncaughtExceptionHandler, which typically prints the Throwable stack trace to System.err, will be invoked if no custom handler has been installed. On the other hand, a Throwable generated by a task queued with submit() will bind the http://atoz-tech.blogspot.com/2015/10/handling-exceptions-in-thread.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-7685683805554347622Fri, 02 Oct 2015 07:50:00 +00002015-10-02T00:50:16.084-07:00Interview Questions public class StudentRemoveDuplicates {    public static void main(String[] args) {        List list1 = new ArrayList();        list1.add(new Student("Amit", "100"));        list1.add(new Student("Anindita", "101"));        list1.add(new Student("Abcd", "102"));&http://atoz-tech.blogspot.com/2015/10/remove-duplicate-in-arraylist-using.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-7989849158096854598Fri, 02 Oct 2015 07:05:00 +00002015-10-02T00:05:02.598-07:00Interview Questions First remove duplicates: arrayList1.removeAll(arrayList2); Then merge two arrayList: arrayList1.addAll(arrayList2); Lastly, sort your arrayList if you wish: collections.sort(arrayList1);   import java.util.ArrayList;import java.util.Collections;import java.util.List;public class ArrayListDuplicates {    public static void main(String[] args) { http://atoz-tech.blogspot.com/2015/10/2-arraylist-remove-duplicates-without.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-1069616930246265902Fri, 02 Oct 2015 04:47:00 +00002015-10-01T21:47:06.375-07:00Interview Questions Set<Thread> threadSet = Thread.getAllStackTraces().keySet(); for (Thread thread: threadSet) { System.out.println(thread.getId()); }   Make sure you read and understand the method Thread.getAllStackTraces() before using them. http://atoz-tech.blogspot.com/2015/10/all-threads-and-its-current-status.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-1251851403289136298Sat, 26 Sep 2015 12:03:00 +00002015-09-26T05:03:53.806-07:00Interview Questions Load Balancer It is needed if you have so many requests which can not be handled by one web server. Typically 10-15k requests per second can be handled by one web server for a dynamic website, but it depends totally on complexity of website/web application. Load balancer contains multiple web servers and just forwards incoming requests to one of them to distribute. Separate cdn server To http://atoz-tech.blogspot.com/2015/09/how-does-website-handle-million-users.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-4651258117876628465Sat, 29 Aug 2015 16:44:00 +00002015-08-29T09:46:44.753-07:00Interview Questions public class LinkedHashSetExample {    public static void main(String[] args)     {         //Creating LinkedHashSet          LinkedHashSet set = new LinkedHashSet();          //Adding elements to LinkedHashSet     http://atoz-tech.blogspot.com/2015/08/internal-implementation-of-linkedhashset.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-2364025987215863977Sat, 29 Aug 2015 14:16:00 +00002015-08-29T07:16:13.346-07:00Interview Questions Below is a list of the Big O complexities in order of how well they scale relative to the dataset. O(1)/Constant Complexity: Constant.  This means irrelevant of the size of the data set the algorithm will always take a constant time. 1 item takes 1 second, 10 items takes 1 second, 100 items takes 1 second. It always takes the same amount of time. O(log n)/http://atoz-tech.blogspot.com/2015/08/order-of-in-java-on-o1-olog-n.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-8173324813552861633Sat, 29 Aug 2015 08:26:00 +00002015-08-29T01:28:55.193-07:00Interview Questions Have four indexes: top, down, left and right which are gonna be used to point where we are gonna start printing rows and columns. When      top > down OR left > right then we are DONE!!!!! public class MultiDimSpiralPrint {    public static void main(String[] args) {        int[][] i = {      &http://atoz-tech.blogspot.com/2015/08/print-multi-dimention-array-mxn-in.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-7969754753889614Sat, 29 Aug 2015 07:07:00 +00002015-08-29T00:07:11.836-07:00Interview QuestionsJava Concurrency This is possible by :  EvenOddPrint [synchronization + wait () + notifyAll () ]+ 2 Threads (odd/even) + Task [ impl runnable having run() deciding when to call what method of EvenOddPrint ] Task#1 -> Write a EvenOddPrint Class  - flag to decide when to wait else notify and print -sync printEven() and printOdd() using wait notifyAll  public class EvenOddPrint {  &http://atoz-tech.blogspot.com/2015/08/java-thread-print-odd-even-numbers.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-8402239374654899796Mon, 24 Aug 2015 04:23:00 +00002015-08-23T21:28:33.265-07:00 public class Employee {     private String name;     private String jobTitle;     private int age;     private int salary;     public Employee(String name, String jobTitle, int age, int salary) {         this.name = name;    &nbsphttp://atoz-tech.blogspot.com/2015/08/apache-comparetobuilder-sort-employees.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-4510992817256919653Sun, 23 Aug 2015 08:38:00 +00002015-08-23T01:38:01.110-07:00Interview Questions http://atoz-tech.blogspot.com/2015/08/jvm-parameters-in-java.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-1509384548350446706Sun, 23 Aug 2015 08:32:00 +00002015-08-23T01:43:44.689-07:00   http://atoz-tech.blogspot.com/2015/08/java-memory-modal.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-7732491294285694988Sat, 22 Aug 2015 14:48:00 +00002015-08-22T07:48:18.633-07:00Interview QuestionsJava Concurrency public class MyBlockingQueue { //Instead use internal BlockingQueue of concurrent package       private Object lock = new Object();    private List queue = new LinkedList();    private int limit = 10;    public MyBlockingQueue(int limit) {        this.limit = limit;    }  http://atoz-tech.blogspot.com/2015/08/producer-consumer-using-custom.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-8175021190731585116.post-5021285113160728237Sat, 08 Aug 2015 05:54:00 +00002015-08-07T22:54:24.488-07:00MAC Command + F5 will turn it off Completely http://atoz-tech.blogspot.com/2015/08/turn-off-voice-over-for-my-mac.htmlnoreply@blogger.com (AC)0