/**
 * A test of threads in Java.
 */
public class ThreadTest implements Runnable {

  public static void main(String[] args) throws InterruptedException {

    long tid = Thread.currentThread().getId();
    System.out.println("Starting main thread, tid is " + tid);

    Thread[] threads = new Thread[5];

    for (int i = 0; i < 5; i++) {
      Thread t = new Thread(new ThreadTest()); // create the Thread object
      threads[i] = t;
      t.start(); // start running the new thread concurrently
    }

    for (int i = 0; i < 5; i++) {
      threads[i].join(); // wait until threads[i] finishes
    }

    System.out.println("Exiting main thread");
  }

  @Override
  public void run() {

    long tid = Thread.currentThread().getId();
    System.out.println("Running thread, tid is " + tid);

    try {
      Thread.sleep(1000); // do some work ...
    } catch (InterruptedException e) {}

    System.out.println("Exiting thread, tid is " + tid);
  }

}