InterruptSleep.java

//: c14:InterruptSleep.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// The alternative approach to using suspend()
// and resume(), which are deprecated in Java 2.
// <applet code=InterruptSleep width=400 height=200>
// </applet>
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;

public class InterruptSleep extends JApplet {
   private JTextField txt = new JTextField(30);
   private JButton 
       interruptB = new JButton("Interrupt Sleep");

   private Counting countingThread = new Counting();

   class Counting extends Thread {
      private int count = 0;

      public Counting() { 
         start(); 
      }


      public synchronized void funInterrupt() {
         System.err.println("Interrupt Button");
         interrupt();
      }

      public void run() {
         while (true) {
            txt.setText("Count: " + Integer.toString(count++));
            try{
               sleep(8000);
            } 
            catch(InterruptedException e) {
               System.err.println("sleep(8 seconds): Interrupted");
            }
         }//true
      }//run
   }//thread
   public void init() {
      Container cp = getContentPane();
      cp.setLayout(new FlowLayout());
      cp.add(txt);

      interruptB.addActionListener( new ActionListener() {
         public 
             void actionPerformed(ActionEvent e) {
                countingThread.funInterrupt();
         }
      }
      );
      cp.add(interruptB);
      interruptB.setEnabled(true);
      interruptB.setBackground(Color.green);
   }
   public static void main(String[] args) {
      Console.run(new InterruptSleep(), 400, 200);
   }
}//JApplet