SCJP Sun Certified Programmer for Java 6 Study Guide - Self Test

Which is true?
A. "X extends Y" is correct if and only if X is a class and Y is an interface.
B. "X extends Y" is correct if and only if X is an interface and Y is a class.
C. "X extends Y" is correct if X and Y are either both classes or both interfaces.
D. "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces.

Which method names follow the JavaBeans standard? (Choose all that apply).

A. addSize
B. getCust
C. deleteRep
D. isColorado
E. putDimensions

Given:
1. class Voop {
2. public static void main (String [] args) {
3. doStuff(1);
4. doStuff(1,2);
5. }
6. //Insert code here.
7. }

Which inserted independently at line 6, will compile? (Choose all that apply)

A. static void doStuff(int... doArgs) {}
B. static void doStuff(int[] doArgs) {}
C. static void doStuff(int doArgs...) {}
D. static void doStuff(int x, int... doArgs) {}

Given:
1. enum Animals {
2. DOG("woof"), CAT("meow"), FISH("burble");
3. String sound;
4. Animals(String s ){ sound =s;}
5. }
6. class TestEnum {
7. static Animals a;
8. public static void main (String[] args) {
9. System.out.println (a.Dog.sound + "" + a.FISH.sound);
10. }
11. }

What is the result?

A. woof burble
B. Multiple compilation errors.
C. Compilation fails due to an error on line 2.
D. Compilation fails due to an error on line 3.
E. Compilation fails due to an error on line 4.
E. Compilation fails due to an error on line 9.

Given two files:
1. package pkgA;
2. public class Foo {
3. int a = 5;
4. protected int b = 6;
5. public int c = 7;
6. }

3. package pkgB;
4. import pkgA.*;
5. public class Baz {
6. public static void main ( String [] args){
7. Foo f = new Foo();
8. System.out.print(" " + f.a);
9. System.out.print(" " + f.b);
10. System.out.print(" " + f.c);
11. }
12. }

What is the restult? (Choose all that apply)

A. 5 6 7
B. 5 followed by an exception
C. Compilation fails with an error on line 7
D. Compilation fails with an error on line 8
E. Compilation fails with an error on line 9
F. Compilation fails with an error on line 10