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Sun Certification Interview Question:

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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.

Submitted by: Administrator

E:Compilation fails due to an error on line 26.
Submitted by: Administrator

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Explain Given: 1. public class Blip { 2. protected int blipvert(int x) { return 0; } 3. } 4. class Vert extends Blip { 5. // insert code here 6. } Which five methods, inserted independently at line 5, will compile? (Choose five.) A. public int blipvert(int x) { return 0; } B. private int blipvert(int x) { return 0; } C. private int blipvert(long x) { return 0; } D. protected long blipvert(int x) { return 0; } E. protected int blipvert(long x) { return 0; } F. protected long blipvert(long x) { return 0; } G. protected long blipvert(int x, int y) { return 0; }

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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

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Suppose A team of programmers is reviewing a proposed API for a new utility class. After some discussion, they realize that they can reduce the number of methods in the API without losing any functionality. If they implement the new design, which two OO principles will they be promoting? A. Looser coupling B. Tighter coupling C. Lower cohesion D. Higher cohesion E. Weaker encapsulation F. Stronger encapsulation

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Explain 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.

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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

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