How can I make a thread run only if the other thread is running too, meaning, if I return from run in one thread, then I want the other to stop running too, my code looks something like this:

    ClientMessageHandler clientMessagehandler = new ClientMessageHandler();
  ServerMessageHandler serverMessagehandler = new ServerMessageHandler();
  Thread thread1 = new Thread(serverMessagehandler);
  Thread thread2 = new Thread(clientMessagehandler);
  thread2.start();
  thread1.start();

i want to cause thread1 to stop running when thread2 stops running.

thanks