Thread Answer Error

[naveen yadav]

This question is from Practice Exam book form K & B.

4. public class Zingseng extends Thread {
5. public static void main(String[] args) throws Exception {
6. Thread t1 = new Thread(new Zingseng());
7. t1.start();
8. // insert code here
9. for(int i = 0; i < 1000; i++) // Loop #1
10. System.out.print(Thread.currentThread().getName() + " ");
11. }
12. public void run() {
13. for(int i = 0; i < 1000; i++) // Loop #2
14. System.out.print(Thread.currentThread().getName() + " ");
15. } }

Given Anser in book
t. yield() and t.join()will make most (or all) of Loop #2’s iterations
run before most (or all) of Loop #1’s iterations?

When I tried out it
t.join() is good But t.yield() is not.

[Henry Wong]

naveen yadav wrote:When I tried out it
t.join() is good But t.yield() is not.

Look up the join() and the yield() method. And see if you can figure out why the join() method works here, and the yield() method does not.

It's pretty easy. Look into it a bit.


Or is the point of this question to confirm the error? In which case, I agree with you...
Henry

[naveen yadav]

Yes I want to confirm about the error in the ANSWER CHOICE which says "join() and yield BOTH will produce required output".
but in Real World Only join() will work whereas yield will not produce desired output.

Agree??

[Jeffrey Tian]

Why can't t1.yield() be chosen? Below is from Java 6 API for Thread.yield():
"public static void yield(): Causes the currently executing thread object to temporarily pause and allow other threads to execute."

I think yield() will cause current main thread to pause and gives t1 a chance to run.