synchronrized and join()

[sudarsan ym]

class test
{
synchronized method1()
{
// some code...
}
}
class demo extends Thread
{
test t;
demo(test t1)
{
t = t1;
}
public void run()
{
t.method1();
}
}
class sample
{
public static void main()
{
test tx = new test()
demo d = new demo(tx);
d.start();
//What will happen if d.join(); is executed
}
}

[Paul Caudle]

The current thread (the one running the main method) will wait for the execution of t.method1() to finish in the thread labeled d and then continue with execution of the main. Since there is no more code in the main the application will return/end.
Is that the kind of answer you were looking for here?
Paul

[Tanveer Rameez]

hi
if you want to find what join() does, see this code:

  public class test extends Thread{  
      public void run()  {  
          for(int i=0;i<1000;i++){    
      System.out.println("printing:"+i);  
  }
      }  
      public static void main(String args[]){     
  test t=new test();     
  t.start(); 
  try{
      t.join();     
  }catch(Exception e) {
  }
  System.out.println("exiting main");     
} 
}

here if you comment the t.join(); , then even before the run method completes, the "exiting main" will be printed, i.e the main thread will exit before the thread t completes. But if you run the code as it is, then the main thread will wait for the thread t to complete. Then after "printing 999" is printed, "exiting main" will be printed.
I hope this is what u wanted
bye
Tanveer
Tanveer I have modified your code so that it has a try block for the join() method . Hope you don't mind

[This message has been edited by Rahul Mahindrakar (edited December 12, 2000).]