[IT认证]Sun+SCJP认证考试题集.doc

310-055SCJIP认证考试题集 Question 1 Given: 11. public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12? (Choose three.) A. final B. static C. native D. public E. private F. abstract G. protected Answer: ABD Question 2 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.) A. foreach(x) System.out.println(z); B. for(int z : x) System.out.println(z); abcd C. while( x.hasNext()) System.out.println( x.next()); D. for( int i=0; i x.length; i++ ) System.out.println(x[i]); Answer: BD Question 3 Given: 11. public class Test { 12. public static void main(String [] args) { 13. int x =5; 14. boolean b1 = true; 15. boolean b2 = false; 16. 17.if((x==4) !b2) 18. System.out.print(”l “); 19. System.out.print(”2 “); 20. if ((b2 = true) b1) 21. System.out.print(”3 “); 22. } 23. } What is the result? A. 2 B. 3 C. 1 2 D. 2 3 E. 1 2 3 F. Compilation fails. G. Au exceptional is thrown at runtime. Answer: D Question 4 4. 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: BCE lQuestion 5 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 a java.lang.ClassCastException? A. Alpha a = x; B. Foo f= (Delta)x; C. Foo f= (Alpha)x; D. Beta b = (Beta)(Alpha