JAVA SCJP-OCPJP DUMPS | SCJP-OCPJP EXAM

Serialization and java.io Ques: 01

2013-08-27T13:36:00.001+05:30

Serialization and java.io Ques: 02

Given:

12. import java.io.*;

13. public class Forest implements Serializable {

14. private Tree tree = new Tree();

15. public static void main(String [] args) {

16. Forest f = new Forest();

17. try {

18. FileOutputStream fs = new FileOutputStream("Forest.ser");

19. ObjectOutputStream os = new ObjectOutputStream(fs);

20. os.writeObject(f); os.close();

21. } catch (Exception ex) { ex.printStackTrace(); }

22. } }

23.

24. class Tree { }

What is the result?

A. Compilation fails.

B. An exception is thrown at runtime.

C. An instance of Forest is serialized.

D. An instance of Forest and an instance of Tree are both serialized.

Answer: B

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Collections and Generics Ques: 02

2013-08-06T19:04:00.000+05:30

Collections and Generics Ques: 02

Click the Exhibit button

Which statement is true about the set variable on line 12?

A. The set variable contains all six elements from the coll collection, and the order is guaranteed to be

preserved.

B. The set variable contains only three elements from the coll collection, and the order is guaranteed to be preserved.

C. The set variable contains all six elements from the coll collection, but the order is NOT guaranteed to be preserved.

D. The set variable contains only three elements from the coll collection, but the order is NOT guaranteed to be preserved.

Answer: D

Collections and Generics Ques: 01

2013-08-06T18:57:00.003+05:30

Collections and Generics Ques: 01

Given:

34. HashMap props = new HashMap();

35. props.put("key45", "some value");

36. props.put("key12", "some other value");

37. props.put("key39", "yet another value");

38. Set s = props.keySet();

39. // insert code here

What, inserted at line 39, will sort the keys in the props HashMap?

A. Arrays.sort(s);

B. s = new TreeSet(s);

C. Collections.sort(s);

D. s = new SortedSet(s);

Answer: B

Garbage Collection Ques: 03

2013-08-05T17:51:00.003+05:30

Garbage Collection Ques: 03

Given:

11. rbo = new ReallyBigObject();

12. // more code here

13. rbo = null;

14. /* insert code here */

Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward

recycling the memory used by the object rbo?

A. System.gc();

B. Runtime.gc();

C. System.freeMemory();

D. Runtime.getRuntime().growHeap();

E. Runtime.getRuntime().freeMemory();

Answer: A

Garbage Collection Ques: 02

2013-07-30T19:11:00.003+05:30

Garbage Collection Ques: 02

Given:

11. public void genNumbers() {

12. ArrayList numbers = new ArrayList();

13. for (int i=0; i<10 font="" i="">

14. int value = i * ((int) Math.random());

15. Integer intObj = new Integer(value);

16. numbers.add(intObj);

17. }

18. System.out.println(numbers);

19. }

Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for

garbage collection?

A. Line 16

B. Line 17

C. Line 18

D. Line 19

E. The object is NOT a candidate for garbage collection.

Answer: D

Garbage Collection Ques: 01

2013-07-18T18:32:00.000+05:30

Garbage Collection

Ques: 01 Given:

1. public class GC {

2. private Object o;

3. private void doSomethingElse(Object obj) { o = obj; }

4. public void doSomething() {

5. Object o = new Object();

6. doSomethingElse(o);

7. o = new Object();

8. doSomethingElse(null);

9. o = null;

10. }

11.}

When the doSomething method is called, after which line does the Object created in line 5 become

available for garbage collection?

A. Line 5

B. Line 6

C. Line 7

D. Line 8

E. Line 9

F. Line 10

Answer: D

Exception Handling Ques: 03

2013-07-16T14:34:00.001+05:30

Exception Handling

Ques: 03 Given:

31. //some code here

32. try {

33. //some code here

34. } catch (SomeException se) {

35. //some code here

36. } finally {

37. // some code here

38. }

Under which three circumstances will the code on line 37 be executed? (Choose three.)

A. The instance gets garbage collected.

B. The code on line 33 throws an exception.

C. The code on line 35 throws an exception.

D. The code on line 31 throws an exception.

E. The code on line 33 executes successfully.

Answer: B, C, E

Exception Handling Ques: 02

2013-07-04T19:06:00.001+05:30

Exception Handling

Ques: 02 Given:

84. try {

85. ResourceConnection con = resourceFactory.getConnection();

86. Results r = con.query("GET INFO FROM CUSTOMER");

87. info = r.getData();

88. con.close();

89. } catch (ResourceException re) {

90. errorLog.write(re.getMessage());

91. }

92. return info;

Which statement is true if a ResourceException is thrown on line 86?

A. Line 92 will not execute.

B. The connection will not be retrieved in line 85.

C. The resource connection will not be closed on line 88.

D. The enclosing method will throw an exception to its caller.

Answer: C

Exception Handling Ques: 01

2013-07-03T12:40:00.003+05:30

Exception Handling

Q: 01 Given:

11. public static void parse(String str) {

12. try {

13. float f = Float.parseFloat(str);

14. } catch (NumberFormatException nfe) {

15. f = 0;

16. } finally {

17. System.out.println(f);

18. }

19. }

20. public static void main(String[] args) {

21. parse("invalid");

22. }

What is the result?

A. 0.0

B. Compilation fails.

C. A ParseException is thrown by the parse method at runtime.

D. A NumberFormatException is thrown by the parse method at runtime.

Answer: B

OOPs Ques: 41

2013-07-02T14:24:00.003+05:30

Ques: 41

Given:

10. class One {

11. void foo() { }

12. }

13. class Two extends One {

14. //insert method here

15. }

Which three methods, inserted individually at line 14, will correctly complete class Two? (Choose three.)

A. int foo() { /* more code here */ }

B. void foo() { /* more code here */ }

C. public void foo() { /* more code here */ }

D. private void foo() { /* more code here */ }

E. protected void foo() { /* more code here */ }

Answer: B, C, E

OOPs Ques: 40

2013-07-02T14:19:00.000+05:30

Ques: 40 Given:

11. public class ItemTest {

12. private final int id;

13. public ItemTest(int id) { this.id = id; }

14. public void updateId(int newId) { id = newId; }

15.

16. public static void main(String[] args) {

17. ItemTest fa = new ItemTest(42);

18. fa.updateId(69);

19. System.out.println(fa.id);

20. }

21. }

What is the result?

A. Compilation fails.

B. An exception is thrown at runtime.

C. The attribute id in the Item object remains unchanged.

D. The attribute id in the Item object is modified to the new value.

E. A new Item object is created with the preferred value in the id attribute.

Answer: A

OOPs Ques: 39

2013-07-01T18:29:00.004+05:30

Ques: 39 Given:

1. interface TestA { String toString(); }

2. public class Test {

3. public static void main(String[] args) {

4. System.out.println(new TestA() {

5. public String toString() { return "test"; }

6. });

7. }

8. }

What is the result?

A. test

B. null

C. An exception is thrown at runtime.

D. Compilation fails because of an error in line 1.

E. Compilation fails because of an error in line 4.

F. Compilation fails because of an error in line 5.

Answer: A

OOPs

2012-03-04T15:31:00.000+05:30

Ques: 37
Given:
1. class TestA {
2.    public void start() { System.out.println("TestA"); }
3. }

4. public class TestB extends TestA {
5.    public void start() { System.out.println("TestB"); }
6.   public static void main(String[] args) {
7.     ((TestA)new TestB()).start();
8.   }
9. }

What is the result?
A. TestA
B. TestB
C. Compilation fails.
D. An exception is thrown at runtime.
Answer: B

OOPs 1

2012-02-17T00:20:00.000+05:30

Ques 17: Given:
class One {
public One() { System.out.print(1); }
}
class Two extends One {
    public Two() { System.out.print(2); }
}
class Three extends Two {
    public Three() { System.out.print(3); }
}
public class Numbers{
    public static void main( String[] argv ) { new Three(); }
}

What is the result when this code is executed?
A. 1
B. 3
C. 123
D. 321
E. The code runs with no output.
Answer: C

Exception Handling - 2

2012-02-08T01:35:00.000+05:30

Ques 2:
Which are most typically thrown by an API developer or an application developer as opposed to being thrown by the JVM? (Choose all that apply.)
A. ClassCastException
B. IllegalStateException
C. NumberFormatException
D. IllegalArgumentException
E. ExceptionInInitializerError

Answer:
-- B , C, and D are correct. B is typically used to report an environment problem such as trying to access a resource that’s closed. C is often thrown in API methods that attempt
to convert poorly formed String arguments to numeric values. D is often thrown in API
methods that receive poorly formed arguments.
-- A and E are thrown by the JVM.

Exceptions Handing -1

2012-02-08T01:26:00.000+05:30

Que 1:

class Input {
   public static void main(String[] args) {
     String s = "-";
     try {
          doMath(args[0]);
          s += "t "; // line 6
      }
    finally { System.out.println(s += "f "); }
    }
   public static void doMath(String a) {
       int y = 7 / Integer.parseInt(a);
   }

}

And the command-line invocations:
java Input
java Input 0
Which are true? (Choose all that apply.)
A. Line 6 is executed exactly 0 times.
B. Line 6 is executed exactly 1 time.
C. Line 6 is executed exactly 2 times.
D. The finally block is executed exactly 0 times.
E. The finally block is executed exactly 1 time.
F. The finally block is executed exactly 2 times.
G. Both invocations produce the same exceptions.
H. Each invocation produces a different exception.
Answer:
-> A , F, and H are correct. Since both invocations throw exceptions, line 6 is never reached. Since both exceptions occurred within a try block, the finally block will always execute. The first invocation throws an ArrayIndexOutOfBoundsException, and the second invocation throws an ArithmeticException for the attempt to divide by zero.
-> B, C, D, E, and G are incorrect based on the above.

Sun Certified Java Programmer ( SCJP- OCPJP ) Certification DUMPS

2010-09-22T00:46:00.000+05:30

Following are link for SCJP/OCPJP DUMPS:

1. Language Fundamentals

2. OOPs

3. Declarations and Access Control

4. Operators

5. Flow Control

6. Assertions

7. Exception Handling

8. Garbage Collection

9. Multi-Threading

10. Collections and Generics

11. Java Package

12. Development

13. Internationalization

14. java.io and Serialization

15. Inner Classes

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