310-056 Sun - Braindumps.com.ua: question list for "Sun Certified Programmer for J2SE 5.0 Upgrade Exam", page: 3

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Sun 310-056: Sun Certified Programmer for J2SE 5.0 Upgrade Exam

#21. Given:

 10. public class Bar { 
 11. static void foo( int...x ) { 
 12. // insert code here 
 13. } 
 14. }

Which two code fragments, inserted independently at line 12, will allow the class to compile? (Choose two.)

#22. Given:

 55. int[] x = {1,2,3,4,5}; 
 56. int y[] = x; 
 57. System.out.println(y[2]);

Which statement is true?

#23. Given:

 1. import java.util.*; 
 2. public class Example { 
 3. public static void main(String[] args) { 
 4. //insert code here 
 5. set.add(new lnteger(2)); 
 6. set.add(new lnteger(1)); 
 7. System.out.println(set); 
 8. } 
 9. }

Which code, inserted at line 4, guarantees that this program will output [1, 2]?

#24. Given:

 1. public class Drink implements Comparable { 
 2. public String name; 
 3. public int compareTo(Object o) { 
 4. return 0; 
 5. } 
 }

and

 20. Drink one = new Drink(); 
 21. Drink two = new Drink(); 
 22. one.name = “Coffee”; 
 23. two .name = “Tea”; 
 24. TreeSet set = new Treeset(); 
 25. set.add(one); 
 26. set.add(two);

A programmer iterates over the TreeSet and prints the name or each Drink object. What is the result?

#25. A programmer must create a generic class MinMax and the type parameter of MinMax must implement Comparable.
Which implementation of MinMax will compile?

#26. 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?

#27. Given:

 11. public static Collection get() { 
 12. Collection sorted = new LinkedList(); 
 13. sorted.add(”B”); sorted.add(”C”); sorted.add(”A”); 
 14. return sorted; 
 15. } 
 16. public static void main(String] args) { 
 17. for(Object obj: gets()) { 
 18. System.out.print(obj + “ , “); 
 19. } 
 20. }

What is the result?

#28. Given:

 12. public class Test { 
 13. public enum Dogs {collie, harrier}; 
 14. public static void main(String [] args) { 
 15. Dogs myDog = Dogs.collie; 
 16. switch (myDog) { 
 17. case collie: 
 18. System.out.print(”collie “); 
 19. case harrier 
 20. System.out.print(”harrier “); 
 21. } 
 22. } 
 23.}

What is the result?

#29. Given:

 10. interface Foo {} 
 11. class Alpha implements Foo {} 
 12. class Beta extends Alpha {} 
 13. class Delta extends Beta { 
 14. public static void main( String[] args ) { 
 15. Beta x = new Beta(); 
 16. // insert code here 
 17. } 
 18. }

Which code, inserted at line 16, will cause ajava.lang.ClassCastException?

#30. Given:

 11. Float pi = new Float(3.14f); 
 12. if(pi > 3) { 
 13. System.out.print(”pi is bigger than 3.”); 
 14. } 
 15. else { 
 16. System.out.print(”pi is not bigger than 3. “); 
 17. } 
 18. finally { 
 19. System.out.println(”Have a nice day.”); 
 20. }

What is the result?

[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] ... [12]

gen. 0.269

Server date 06:24 10-01-2009

Sun 310-056

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