📄 suspendframe.html

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<html><head><title>Display page for Suspend at www.BruceEckel.com</title></head><FONT FACE="Verdana,Tahoma,Arial,Helvetica,Sans"><H2>Suspend.java</H2><hr></FONT>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
    width="300" height="100" align="baseline"
    codebase="http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0">
<PARAM NAME="code" VALUE="Suspend.class">
<PARAM NAME="codebase" VALUE=".">
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.2.2">
<COMMENT>
    <EMBED type="application/x-java-applet;version=1.2.2" 
       width="300" height="100" align="baseline" 
       code="Suspend.class" 
       codebase="."
       pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html">
    <NOEMBED>
    </COMMENT>
       No Java 2 support for APPLET!!
    </NOEMBED></EMBED>
</OBJECT>
<FONT SIZE="+3"><PRE><B>
//: c14:Suspend.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.
// &lt;applet code=Suspend width=300 height=100&gt;
// &lt;/applet&gt;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;

public class Suspend extends JApplet {
  private JTextField t = new JTextField(10);
  private JButton 
    suspend = new JButton("Suspend"),
    resume = new JButton("Resume");
  private Suspendable ss = new Suspendable();
  class Suspendable extends Thread {
    private int count = 0;
    private boolean suspended = false;
    public Suspendable() { start(); }
    public void fauxSuspend() { 
      suspended = true;
    }
    public synchronized void fauxResume() {
      suspended = false;
      notify();
    }
    public void run() {
      while (true) {
        try {
          sleep(100);
          synchronized(this) {
            while(suspended)
              wait();
          }
        } catch(InterruptedException e) {
          System.err.println("Interrupted");
        }
        t.setText(Integer.toString(count++));
      }
    }
  } 
  public void init() {
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(t);
    suspend.addActionListener(
      new ActionListener() {
        public 
        void actionPerformed(ActionEvent e) {
          ss.fauxSuspend();
        }
      });
    cp.add(suspend);
    resume.addActionListener(
      new ActionListener() {
        public 
        void actionPerformed(ActionEvent e) {
          ss.fauxResume();
        }
      });
    cp.add(resume);
  }
  public static void main(String[] args) {
    Console.run(new Suspend(), 300, 100);
  }
} ///:~
</B></PRE></FONT></body></html>
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