1. public class Test {

2. public static void main(String args[]) {

3. class Foo {

4. public int i = 3;

5. }

6. Object o = (Object)new Foo();

7. Foo foo = (Foo)o;

8. System.out.println("i = " + foo.i);

9. }

10. }

What is the result?

A. i = 3

B. Compilation fails.

C. A ClassCastException is thrown at line 6.

D. A ClassCastException is thrown at line 7.

Answer: A


Which two cause a compiler error? (Choose two)

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

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

C. float[] f1 = new float[3];

D. float f3[] = new float[3];

E. float f5[] = { 1.0f, 2.0f, 2.0f };

F. float f4[] = new float[] { 1.0f. 2.0f. 3.0f};

Answer: A, B



11. int i =1,j =10;

12. do {

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

14. continue;

15. }

16. } while (i <5);

17. System.out.println("i = " +i+ "and j = "+j);

What is the result?

A. i = 6 and j = 5

B. i = 5 and j = 5

C. i = 6 and j = 5

D. i = 5 and j = 6

E. i = 6 and j = 6

Answer: D



1. class Test {

2. private Demo d;

3. void start() {

4. d = new Demo();

5. this.takeDemo(d);

6. }


8. void takeDemo(Demo demo) {

9. demo = null;

10. demo = new Demo();

11. }

12. }

When is the Demo object, created on line 3, eligible for garbage collection?

A. After line 5.

B. After line 9.

C. After the start() method completes.

D. When the takeDemo() method completes.

E. When the instance running this code is made eligible for garbage collection.

Answer: E


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