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    Sun Certified Java Developer Interview Questions & Answers

    Below we have listed all the Sun Certified Java Developer Interview Questions and answers. Feel free to comment on any Sun Certified Java Developer Interview Questions or answer by the comment feature available on the page.

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    Explain Given: 5. class Atom { 6. Atom() { System.out.print("atom "); } 7. } 8. class Rock extends Atom { 9. Rock(String type) { System.out.print(type); } 10. } 11. public class Mountain extends Rock { 12. Mountain() { 13. super("granite "); 14. new Rock("granite "); 15. } 16. public static void main(String[] a) { new Mountain(); } 17. } What is the result? A. Compilation fails. B. atom granite C. granite granite D. atom granite granite E. An exception is thrown at runtime. F. atom granite atom granite
    View Answer
    Explain Given: 10. class Nav{ 11. public enum Direction { NORTH, SOUTH, EAST, WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } Which code, inserted at line 14, allows the Sprite class to compile? A. Direction d = NORTH; B. Nav.Direction d = NORTH; C. Direction d = Direction.NORTH; D. Nav.Direction d = Nav.Direction.NORTH;
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    Explain IF you are remotely logged on to a Solaris machine, What command would you execute?
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    Explain Given: 21. class Money { 22. private String country = "Canada"; 23. public String getC() { return country; } 24. } 25. class Yen extends Money { 26. public String getC() { return super.country; } 27. } 28. public class Euro extends Money { 29. public String getC(int x) { return super.getC(); } 30. public static void main(String[] args) { 31. System.out.print(new Yen().getC() + " " + new Euro().getC()); 32. } 33. } What is the result? A. Canada B. null Canada C. Canada null D. Canada Canada E. Compilation fails due to an error on line 26. F. Compilation fails due to an error on line 29.
    View Answer
    Explain Given: 11. class PingPong2 { 12. synchronized void hit(long n) { 13. for(int i = 1; i < 3; i++) 14. System.out.print(n + "-" + i + " "); 15. } 16. } 17. public class Tester implements Runnable { 18. static PingPong2 pp2 = new PingPong2(); 19. public static void main(String[] args) { 20. new Thread(new Tester()).start(); 21. new Thread(new Tester()).start(); 22. } 23. public void run() { pp2.hit(Thread.currentThread().getId()); } 24. } Which statement is true? A. The output could be 5-1 6-1 6-2 5-2 B. The output could be 6-1 6-2 5-1 5-2 C. The output could be 6-1 5-2 6-2 5-1 D. The output could be 6-1 6-2 5-1 7-1
    View Answer
    Explain Given: 5. class Atom { 6. Atom() { System.out.print("atom "); } 7. } 8. class Rock extends Atom { 9. Rock(String type) { System.out.print(type); } 10. } 11. public class Mountain extends Rock { 12. Mountain() { 13. super("granite "); 14. new Rock("granite "); 15. } 16. public static void main(String[] a) { new Mountain(); } 17. } What is the result? A. Compilation fails. B. atom granite C. granite granite D. atom granite granite E. An exception is thrown at runtime. F. atom granite atom granite
    View Answer
    Explain Given: 10. class Nav{ 11. public enum Direction { NORTH, SOUTH, EAST, WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } Which code, inserted at line 14, allows the Sprite class to compile? A. Direction d = NORTH; B. Nav.Direction d = NORTH; C. Direction d = Direction.NORTH; D. Nav.Direction d = Nav.Direction.NORTH;
    View Answer
    Explain IF you are remotely logged on to a Solaris machine, What command would you execute?
    View Answer
    Explain Given: 21. class Money { 22. private String country = "Canada"; 23. public String getC() { return country; } 24. } 25. class Yen extends Money { 26. public String getC() { return super.country; } 27. } 28. public class Euro extends Money { 29. public String getC(int x) { return super.getC(); } 30. public static void main(String[] args) { 31. System.out.print(new Yen().getC() + " " + new Euro().getC()); 32. } 33. } What is the result? A. Canada B. null Canada C. Canada null D. Canada Canada E. Compilation fails due to an error on line 26. F. Compilation fails due to an error on line 29.
    View Answer
    Explain Given: 11. class PingPong2 { 12. synchronized void hit(long n) { 13. for(int i = 1; i < 3; i++) 14. System.out.print(n + "-" + i + " "); 15. } 16. } 17. public class Tester implements Runnable { 18. static PingPong2 pp2 = new PingPong2(); 19. public static void main(String[] args) { 20. new Thread(new Tester()).start(); 21. new Thread(new Tester()).start(); 22. } 23. public void run() { pp2.hit(Thread.currentThread().getId()); } 24. } Which statement is true? A. The output could be 5-1 6-1 6-2 5-2 B. The output could be 6-1 6-2 5-1 5-2 C. The output could be 6-1 5-2 6-2 5-1 D. The output could be 6-1 6-2 5-1 7-1
    View Answer
    What is final, finalize() and finally?
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    What are different types of access modifiers?
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    What is the difference between an argument and a parameter?
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    How many ways can an argument be passed to a subroutine and explain them?
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    What is casting?
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    What is the use of bin and lib in JDK?
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    What are methods and how are they defined?
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    What is the difference between constructor and method?
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    What is an Object and how do you allocate memory to it?
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    What are Class, Constructor and Primitive data types?
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