java - Why doesn't thread wait for notify()?

Question

Why doesn't thread wait for notify()? The thread starts and then goes to the waiting pool, but it proceeds to execute after that moment.

public class JavaApplication2 {
    public static void main(String [] args) {
       ThreadB b = new ThreadB();
       synchronized(b) {
           b.start();
           try {
              System.out.println("1");
              b.wait();
         } catch (InterruptedException e) {}
          System.out.println("Total is: " + b.total);
       }
     }
 }
  class ThreadB extends Thread {   
    int total;
      @Override
    public void run() {
        synchronized(this) {
            total += 1;
            //notify();
       }
    }
 }

Answer 1

You are synchronizing on the thread object itself, which is wrong usage. What happens is that the dying thread-of-execution always calls notify on its Thread object: Thread.join relies on this. Therefore it is clear why you get the same behavior with and without your own notify in there.

Solution: use a separate object for thread coordination; this is the standard practice.