//: 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.
// <applet code=Suspend width=300 height=100>
// </applet>
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);
}
} ///:~