notify thread

[jagat thoudam]

class TestThread extends Thread{
public void restart(){
startMe();
}
public static void startMe(){
synchronized(TestThread.class){
TestThread.notifyAll();
System.out.println("Trying to Notify");
}
}

public void run()
{

try{
synchronized(this){
wait();
System.out.println("Notified");
}
}
catch(InterruptedException e){}
}

public static void main(String[] args){
TestThread t1 = new TestThread();
t1.start();
t1.restart();

}

}

Why is the thread not notified?

[shivendra tripathi]

since you are calling wait() on instance object, to get your thread notified you have to call notify on the instance object. Problem with your code is you are calling notifyAll() on the class object.

change your code as followes :

   
public void startMe(){ 
synchronized(this){ 
this.notifyAll(); 
System.out.println("Trying to Notify"); 
} 
} 

 

[Campbell Ritchie]

Welcome to JavaRanch

I am not convinced that wait and notify are beginners' topics, so I shall move this thread.

[shivendra tripathi]

startMe() is getting executed prior to run(). put main thread to sleep for some time, to make sure run() is executed prior to startMe().

   
t1.start(); 
t1.sleep(22);
t1.restart();