PRoblem On threads

[Mohit G Gupta]

public class MThread extends Thread{

     static int x=0;

     public  void GotIT(){
          synchronized(this){
               while(x==0){};
               System.out.println(Thread.currentThread().getName());
               System.out.print("A");
          }
     }

     public synchronized void run(){
          GotIT();
     }

     public static void main(String argv[]){
          try{
               MThread mt=new MThread();
               mt.start();
               Thread.sleep(1000);
               System.out.println(Thread.currentThread().getName());
               
               System.out.print("B");
               x=1;
          }catch(Exception e){ }
     }

}

Is the output possible:Thread-0 runs before main
THread-0
A
main
B

i had ran this code 10 times,still the same output

[Lester Burnham]

Not sure what you mean by "Is the output possible: Thread-0 runs before main" - you're observing it, so obviously it's possible.

Since the "B" thread is put to sleep, the JVM will choose some other thread to run, and the "A" thread is the only other user thread in existence - so this behavior is to be expected.

[Ankit Garg]

Thread-0 cannot print anything before main method because of the while loop in the GotIT method which will only end when the main method sets x to 1...

[Abimaran Kugathasan]

mohitkumar gupta wrote:

Is the output possible:Thread-0 runs before main
THread-0
A
main
B

You can't get this output! There is a endless loop on the GotIT() method!

[Ankit Garg]

There is a endless loop on the GotIT() method!

That is not an endless loop. That loop only terminates when x is not 0...

[Abimaran Kugathasan]

Ankit Garg wrote:
That is not an endless loop. That loop only terminates when x is not 0...

Yea, endless loo, if x won't be reset with the value 1 by the main thread! Thanks!