counter3.java

中文JAVA编程思想第二版,一本很好的JAVA入门书籍!

//: c14:Counter3.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Using the Runnable interface to turn the 
// main class into a thread.
// <applet code=Counter3 width=300 height=100>
// </applet>
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;

public class Counter3 
    extends JApplet implements Runnable {
  private int count = 0;
  private boolean runFlag = true;
  private Thread selfThread = null;
  private JButton 
    start = new JButton("Start"),
    onOff = new JButton("Toggle");
  private JTextField t = new JTextField(10);
  public void run() {
    while (true) {
      try {
        selfThread.sleep(100);
      } catch(InterruptedException e) {
        System.err.println("Interrupted");
      }
      if(runFlag) 
        t.setText(Integer.toString(count++));
    }
  }
  class StartL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      if(selfThread == null) {
        selfThread = new Thread(Counter3.this);
        selfThread.start();
      }
    }
  }
  class OnOffL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      runFlag = !runFlag;
    }
  }
  public void init() {
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(t);
    start.addActionListener(new StartL());
    cp.add(start);
    onOff.addActionListener(new OnOffL());
    cp.add(onOff);
  }
  public static void main(String[] args) {
    Console.run(new Counter3(), 300, 100);
  }
} ///:~