Java: How to use Thread.join

Use something like this:

public void executeMultiThread(int numThreads)
   throws Exception
{
    List threads = new ArrayList();

    for (int i = 0; i < numThreads; i++)
    {
        Thread t = new Thread(new Runnable()
        {
            public void run()
            {
                // do your work
            }
        });

        // System.out.println("STARTING: " + t);
        t.start();
        threads.add(t);
    }

    for (int i = 0; i < threads.size(); i++)
    {
        // Big number to wait so this can be debugged
        // System.out.println("JOINING: " + threads.get(i));
        ((Thread)threads.get(i)).join(1000000);
    }

With otherThread being the other thread, you can do something like this:

@Override
public void run() {
    int i = 0;
    int half = (info.size() / 2);

    for (String s : info) {
        i++;
        if (i == half) {
        try {
            otherThread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.printf("%s %s%n", getName(), s);
        Thread.yield(); //Give other threads a chance to do their work
    }       
}

The Java-tutorial from Sun: http://java.sun.com/docs/books/tutorial/essential/concurrency/join.html