🚀 go-pugleaf

class DoSomeWorkThread extends Thread {

    Object lock;

    public DoSomeWorkThread(Object lock) { this.lock = lock; }



    public void run() {

        // simulate some lenghy calculations.

        System.out.println("in worker thread - about to do some lengthy
operation.");

        try { sleep(4000); }

        catch(Exception x) {}

        System.out.println("Finished processing and about to notify main
thread.");

        synchronized(lock) {

            lock.notify();

        }

    }

} // end class DoSomeWork





public class MainWait {

    public static Object lock = new Object();

    public static void main(String[] args) {

        Thread t = new DoSomeWorkThread(lock);

        t.start();



        synchronized(lock) {

            try {

                System.out.println("main thread is about to wait.");

                lock.wait();

            } catch(InterruptedException x) {}

        }

        System.out.println("Main thread has been notified and can do some
finishing stuff.");

    }

} // end class MainWait