arraysynchronized.java

There is a shared object – int array[] between Write and Read. Write sets the array, Read gets the a

package cwq4;

import javax.swing.*;
/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class ArraySynchronized {
  private int[] array = new int[]{-1,-1,-1,-1,-1,-1};
  private boolean writeable = true;
  private int times;
  //private JTextArea textarea;

  public ArraySynchronized() {this.times = 5;}

  public void settimes(int value){
    this.times = value;
  }

  public int gettimes(){
    return this.times;
  }

  public synchronized void setSharedArray(JTextArea output)
   {
      while ( !writeable ) {  // not the producer's turn
         // thread that called this method must wait
         try { wait(); }
         // process Interrupted exception while thread waiting
         catch ( InterruptedException exception ) {
            exception.printStackTrace();
         }
      }
      // set new shared array values
      for (int i =0; i<6; i++)
        this.array[i] = (int)(Math.random()*100);

      //System.out.println( Thread.currentThread().getName() +
        // "************* setting shared array to: " + array[0]+"," + array[1]+","
        // + array[2]+","+ array[3]+","+ array[4]+","+ array[5]+".");
      output.append
          ("write thread setting shared array to: "
           + array[0]+"," + array[1]+"," + array[2]+","+ array[3]+","
           + array[4]+","+ array[5]+".\n");
      // indicate that producer cannot store another value until
      // a consumer retrieve current sharedInt value
      writeable = false;
      // tell a waiting thread to become ready
      notify();
   }

   public synchronized void getAndsortSharedArray(JTextArea output)
   {
     while ( writeable ) {   // not the consumer's turn
         // thread that called this method must wait
         try { wait(); }
         // process Interrupted exception while thread waiting
         catch ( InterruptedException exception ) {
            exception.printStackTrace();
         }
      }
      // indicate that producer cant store another value
      // because a consumer just retrieved sharedInt value
      int[] temp = this.array;
      int tempint;
      writeable = true;

      for (int i = 0; i < 6; i++) {
        for (int j = i; j < 6; j++) {
          if (temp[j] < temp[i]) {
            tempint = temp[i];
            temp[i] = temp[j];
            temp[j] = tempint;
          }
        }
      }
      // tell a waiting thread to become ready
      notify();

      output.append("read thread sort shared array to:       " + temp[0]+"," + temp[1]+","
         + temp[2]+","+ temp[3]+","+ temp[4]+","+ temp[5]+".\n\n" );
   }

 }//end class ArraySynchronized