API Contents - SCJP Sun Certified Programmer for Java Platform SE6 - page 326

Review Questions
1. What is the result of the following code?
3. byte twelve = -12;
4. Byte b1 = new Byte(twelve);
5. Byte b2 = new Byte(twelve);
6. if(b1.byteValue() == b2) {
7. System.out.println(“equal”);
8. } else {
9. System.out.println(“not equal”);
10. }
A. Line 6 generates a compiler error.
B. An exception is thrown on line 6.
C. equal
D. not equal
2. What is the result of the following program?
1. public class Unboxer {
2. private Integer x;
3.
4. public boolean compare(int y) {
5. return x == y;
6. }
7.
8. public static void main(String [] args) {
9. Unboxer u = new Unboxer();
10. if(u.compare(21)) {
11. System.out.println(”true”);
12. } else {
13. System.out.println(”false”);
14. }
15. }
16. }
A. true
B. false
C. Line 5 does not compile.
D. Line 5 throws an exception.
E. Line 10 does not compile.