anonymousinnerclassadapterdemo.java

JAVA程序设计导论那本书上的一些源代码. 在学那本书的下来的

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class AnonymousInnerClassAdapterDemo extends JApplet {
  public AnonymousInnerClassAdapterDemo() {
    ControlMovingMessage2 messagePanel = new ControlMovingMessage2();
    getContentPane().add(messagePanel);
  }

  /** Main method */
  public static void main(String[] args) {
    AnonymousInnerClassAdapterDemo applet = new AnonymousInnerClassAdapterDemo();
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setTitle("AnonymousInnerClassAdapterDemo");
    frame.getContentPane().add(applet, BorderLayout.CENTER);
    applet.init();
    applet.start();
    frame.setSize(700, 320);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation((d.width - frame.getSize().width) / 2,
      (d.height - frame.getSize().height) / 2);
    frame.setVisible(true);
  }
}

class ControlMovingMessage2 extends JPanel {
  private int xCoordinate = 20;
  private int yCoordinate = 20;
  private TickUsingActionEvent tick = new TickUsingActionEvent();

  ControlMovingMessage2() {
    tick.setTickInterval(100);
    tick.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        ControlMovingMessage2.this.actionPerformed(e);
      }
    });

    this.addMouseListener(new MouseAdapter() {
      public void mousePressed(MouseEvent e) {
        ControlMovingMessage2.this.mousePressed(e);
      }
      public void mouseReleased(MouseEvent e) {
        ControlMovingMessage2.this.mouseReleased(e);
      }
    });
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    if (xCoordinate > getWidth())
      xCoordinate = -20;
    else
      xCoordinate += 5;
    g.drawString("I am moving", xCoordinate, yCoordinate);
  }

  public void actionPerformed(ActionEvent e) {
    repaint();
  }

  public void mousePressed(MouseEvent e) {
    tick.suspend();
  }

  public void mouseReleased(MouseEvent e) {
    tick.resume();
  }
}