#21 to #24 SCJP/OCJP Exams Questions & Answers-

21. 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; }

Correct Answer: A,C,E,F,G

22  Given:

1. class Super {

2. private int a;

3. protected Super(int a) { this.a = a; }

4. }

...

11. class Sub extends Super {

12. public Sub(int a) { super(a); }

13. public Sub() { this.a = 5; }

14. }

Which two, independently, will allow Sub to compile? (Choose two.)

A. Change line 2 to:

public int a;

B. Change line 2 to:

protected int a;

C. Change line 13 to:

public Sub() { this(5); }

D. Change line 13 to:

public Sub() { super(5); }

E. Change line 13 to:

public Sub() { super(a); }

Correct Answer: C,D

23. Given:

1. package test;

2.

3. class Target {

4. public String name = "hello";

5. }

What can directly access and change the value of the variable name?

A. any class

B. only the Target class

C. any class in the test package

D. any class that extends Target

Correct Answer: C

24. Which Man class properly represents the relationship "Man has a best friend who is a Dog"?

A. class Man extends Dog { }

B. class Man implements Dog { }

C. class Man { private BestFriend dog; }

D. class Man { private Dog bestFriend; }

E. class Man { private Dog<bestFriend>; }

F. class Man { private BestFriend<dog>; }

Correct Answer: D