Simple EVENT & THREAD question.

Question

Hello,
Let's say I create a thread from the main one... This thread is supposed to do some work while the main one is waiting for the signal that the work is done... After the signal is received by the main thread it can continue to run...
How this could be done in Java ? I'm looking for things that are similar to WaitForSingleObject(...) and SetEvent(...) in Windows...

Answer 1

So you want to fire off a Thread, wait for it to do something, and then continue.
In Java, you'd start off down this road using wait() and notify(), as Tolmak says.
For example,
public class Test {
    public static void main(String[] args) {
        System.out.println("Starting Worker thread...");
        Worker w = new Worker();
        Thread t = new Thread(w);
        synchronized(w) {
            t.start();
            try {
                System.out.println("Waiting for Worker Thread to complete...");
                w.wait();
            } catch (InterruptedException ignore) {}
        System.out.println("Worker Thread finished. All done!");
    public static class Worker implements Runnable {
        public void run() {
            System.out.println("Worker thread is doing something...");
            try {
                Thread.sleep(5000L);
            } catch (InterruptedException ignore) {}
            System.out.println("All done. Notifying Main...");
            synchronized(this) {
                this.notify();
}Does this get you closer to where you want to be?