All I need is help....have a look and make me happy

Question

I'm writing a program which uses java.util.Timer. Check this code:
public class SomeTask extends TimerTask
    public void run()
         notifyAll() ;
} // end of class
public class SomeScheduler extends Timer
     public SomeScheduler()
          scheduleAtFixedRate( new SomeTask(), 0, 50 ) ;
} // end of class
public class SomeClass
     SomeClass() {}
     public void someMethod()
          while( true )
               // do some operations, when finished wait for scheduler notify
               try
                   wait() ;
               catch( InterruptedException e ) {}
} // end of classNow I know this does not work (monitor), but does anyone get the idea of what I'm trying to do? How can I make this work? This way I could 'synchronize' a oouple of threads. Or if you have any other suggestions I'll be more than willing to listen.
Cheers

Answer 1

Here's a few hints:
1) wait() and notifyAll() require you to "own the monitor". This means you must synchronize on the object you are waiting or notifying, before calling these methods.
2) In order for notifyAll() to signal a thread which has wait()'ed, these methods must be invoked on the SAME object. For example:
Object o = new Object();
synchronized (o) {
  o.wait();
// in another thread:
synchronized (o) {
  o.notifyAll();
}