java.lang.Object.wait()

package com.codingdict;



import java.util.Collections;

import java.util.LinkedList;

import java.util.List;



public class ObjectDemo extends Object {



   private List synchedList;



   public ObjectDemo() {

      // create a new synchronized list to be used

      synchedList = Collections.synchronizedList(new LinkedList());

   }



   // method used to remove an element from the list

   public String removeElement() throws InterruptedException {

      synchronized (synchedList) {



         // while the list is empty, wait

         while (synchedList.isEmpty()) {

            System.out.println("List is empty...");

            synchedList.wait();

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

         }

         String element = (String) synchedList.remove(0);



         return element;

      }

   }



   // method to add an element in the list

   public void addElement(String element) {

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

      synchronized (synchedList) {



         // add an element and notify all that an element exists

         synchedList.add(element);

         System.out.println("New Element:'" + element + "'");



         synchedList.notifyAll();

         System.out.println("notifyAll called!");

      }

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

   }



   public static void main(String[] args) {

      final ObjectDemo demo = new ObjectDemo();



      Runnable runA = new Runnable() {



         public void run() {

            try {

               String item = demo.removeElement();

               System.out.println("" + item);

            } catch (InterruptedException ix) {

               System.out.println("Interrupted Exception!");

            } catch (Exception x) {

               System.out.println("Exception thrown.");

            }

         }

      };



      Runnable runB = new Runnable() {



         // run adds an element in the list and starts the loop

         public void run() {

            demo.addElement("Hello!");

         }

      };



      try {

         Thread threadA1 = new Thread(runA, "A");

         threadA1.start();



         Thread.sleep(500);



         Thread threadA2 = new Thread(runA, "B");

         threadA2.start();



         Thread.sleep(500);



         Thread threadB = new Thread(runB, "C");

         threadB.start();



         Thread.sleep(1000);



         threadA1.interrupt();

         threadA2.interrupt();

      } catch (InterruptedException x) {

      }

   }

}