/*
 * Example of implementing a thread using Runnable interface
 */

public class Sleepy implements Runnable
{
   protected Thread thread;
   protected String name;
   protected boolean interrupted;

   public Sleepy(String name)
   {
      this.name = name;
      interrupted = false;
   }

   /*
    * Implement Runnable interface
    */
   @Override
   public void run()
   {
      while (!interrupted)
      {
         System.out.println(name + ": Sleeping");
         try
         { 
            Thread.sleep(1000);
         }
         catch(InterruptedException e)
         {
            interrupted = true;
         } 
         System.out.println(name + ": Awake");
      } 
   }

   /*
    * Starts the thread
    */
   public void start()
   {
      if (thread == null)
      {
         thread = new Thread(this, name);
         thread.start();
      }
   }

   /*
    * Terminates the thread
    */
   public void terminate()
   {  
      thread.interrupt();
      interrupted = true;
      // wait for the thread to terminate
      while (thread.isAlive())
      {
         try
         {
            Thread.sleep(10);
         }
         catch (InterruptedException e)
         {}
      }
      System.out.println(name + ": stopped");
   }
}