Sun Certified Java Developer Question: Download Sun Certification PDF

Explain 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

Answer:

C:any class in the test package

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Explain 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>; }

Explain Given: 1. public class Threads4 { 2. public static void main (String[] args) { 3. new Threads4().go(); 4. } 5. public void go() { 6. Runnable r = new Runnable() { 7. public void run() { 8. System.out.print("foo"); 9. } 10. }; 11. Thread t = new Thread(r); 12. t.start(); 13. t.start(); 14. } 15. } What is the result? A. Compilation fails. B. An exception is thrown at runtime. C. The code executes normally and prints "foo". D. The code executes normally, but nothing is printed.