java.lang.Runtime.addShutdownHook(Thread hook)

package com.codingdict;



public class RuntimeDemo {



   // a class that extends thread that is to be called when program is exiting

   static class Message extends Thread {



      public void run() {

         System.out.println("Bye.");

      }

   }



   public static void main(String[] args) {

      try {



         // register Message as shutdown hook

         Runtime.getRuntime().addShutdownHook(new Message());



         // print the state of the program

         System.out.println("Program is starting...");



         // cause thread to sleep for 3 seconds

         System.out.println("Waiting for 3 seconds...");

         Thread.sleep(3000);



         // print that the program is closing 

         System.out.println("Program is closing...");

      } catch (Exception e) {

         e.printStackTrace();

      }

   }

}