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JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
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Sudipta Das
Greenhorn

Joined: Apr 05, 2001
Posts: 18
This question is also from the mock exam http://jquest.webjump.com. The correct answers are given as 'a' & 'b'. Is only 'b' not enough ? Please advise me.
What can you write at the comment //A in the following code so that this program writes the word "running" to the standard output?
1. class RunTest implements Runnable {
2. public static void main(String args[]) {
3. RunTest rt = new RunTest();
4. Thread t = new Thread(rt);
5. //A
6. }
7. public void run() {
8. System.out.println("running");
9. }
10. void go() {
11. start(1);
12. }
13. void start(int i) {
14. }
15. }
Select all valid answers.

Ans :
a. System.out.println("running");
b. t.start();
c. rt.start();
d. rt.start(1);
Sean Casey
Ranch Hand

Joined: Dec 16, 2000
Posts: 625
In this code answer b is fine. You are implementing the interface Runnable which contains one method to override public void run(). In this definition the run method is properly overridden. A thread object is created and given an instance of the class implementing runnable as it's target, so t.start will move the thread to the runnable state.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Threads