import java.util.Random;

public class HelloWorld {

    private final static int THREADS = 10;
    private final static int MAXWAIT = 4000;

    private final Random _rand = new Random();

    // -----
    
    public static void main(String[] args) {
        new HelloWorld();
    }

    public HelloWorld() {
        for ( int i = 0; i < THREADS; ++i ) {
            new HelloWorldThread(i, _rand.nextInt(MAXWAIT)).start();
        }
    }

}

class HelloWorldThread
        extends Thread {

    private final int _id;
    private final int _toWait;

    // -----

    public HelloWorldThread(int id, int toWait) {
        _id = id;
        _toWait = toWait;
    }

    public synchronized void run() {
        try {
            wait(_toWait);
            System.out.println("Hello, World! Thread "+_id);
        } catch (InterruptedException ie) { }
    }

}