// Concurrent Programming - CS 498-598
// Summer 2002 - A simple, threads-only program.

// Redefining Thread.run() eliminates the need to define a Runnable.  This is
// usually of questionable value.

class
FriendlyThread 
extends Thread {

  public void 
  run() {
    System.out.println("Hello world!");
    }
  }


class
HiThread {

  public static void 
  main(String[] args) {
    big();
    little();
    }
  
  // The over-wrought, Java way to code up a thread.  This code also tries to
  // start a thread twice, which should cause an error the second time around.

  private static void 
  big() {
    FriendlyThread friendlyThread = new FriendlyThread();
    friendlyThread.start();

    try { friendlyThread.start(); }
    catch (IllegalThreadStateException e) {
      System.out.println("Caught an illegal thread state exception.");
      }
    }

  // A somewhat more to the point version of the previous function, sans the
  // double start.

  private static void 
  little() {
    (new FriendlyThread()).start();
    }
  }