java scjp认证考试题库

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QUESTION 2:

Which two cause a compiler error?

(Choose two)

A. float[] = new float(3);

B. float f2[] = new float[];

C. float[] f1 = new

Answer: A, B

The F. statement is incorrect. The float numbers should be separated with

commas and not dots.

QUESTION 3:

Given:

11. int i =1,j =10;

12. do {

13. if(i++> --j) {

14. continue;

15. }

E. i = 6 and j = 6

Answer: D

QUESTION 5:

Given:

1. interface Animal {

2. void soundOff();

3. }

4.

5. class Elephant implements Animal {

6. public void soundOff() {

13. System.out.println("Roar");

14. }

15. }

16.

17. class Alpha1 {

18. static Animal get( String choice ) {

19. if ( choice.equalsIgnoreCase( "meat eater" )) {

20. return new Lion();

21. } else {

22. return new Elephant();

Elephant e = new

Alpha1();

C. Lion 1 = Alpha.get("meat eater");

D. new

Alpha1().get("veggie").soundOff();

Answer: D

QUESTION 6:

Which statement is true?

A. Memory is reclaimed by calling Runtime.gc().

B. Objects are not collected if they are accessible from

cannot be found that is large enough for a particular requirement.

Answer: B

QUESTION 7:

Given:

1. class A {

Actualte s ts . com - The Po w er of Kno w ing

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2. A() { }

3. }

4.

5. class B extends A {

super(). Answer: B, D

QUESTION 8:

Given:

11. int i = 1,j = 10;

12. do {

13. if(i>j) {

14. break;

15. }

16. j--;

17. } while (++i <5);

E. i = 6 and j = 6

Answer: D

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035

QUESTION 10:

You want a class to have access to members of another class in the same package.

Which

is the most restrictive access that accomplishes this objective?

A. public

B. private

11. int x = 3;

12. int y = 1;

13. if (x = y) {

14. System.out.println("x = " + x);

15. }

What is the result?

A. x = 1

B. x = 3

C. Compilation fails.

D. The code runs with no output.

2. int k = 4;

3. }

Which three are equivalent to line 2? (Choose three)

A. final int k =