这是我写的一个模拟秒表的程序，大家看看，给点意见：

程序代码：

/*

 * Clock.java

 * Created on 2004-5-4

 * @author jellen

 *

 */
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
class MyPanel extends JPanel {

 boolean enabled = false;

 double currentX = 150, currentY = 150;

 int totalAngle = 0;

 private static final int centerX = 150;

 private static final int centerY = 250;

 private static final int circleR = 110;

 

 public MyPanel() {
  setLayout(new BorderLayout());
  setBackground(Color.WHITE);
  ButtonPanel buttonPanel = new ButtonPanel();
  add(buttonPanel, BorderLayout.NORTH);

 }

 

 public void paintComponent(Graphics g) {
  super.paintComponent(g);
  Graphics2D g2 = (Graphics2D)g;
  int radius = 2;
  double x, y;
  
  Ellipse2D circle = new Ellipse2D.Double();
  circle.setFrameFromCenter(centerX, centerY, centerX+radius, centerY+radius);
  g2.setColor(Color.BLACK);
  g2.fill(circle);
  
  circle.setFrameFromCenter(centerX, centerY, centerX+circleR, centerY+circleR);
  g2.setColor(Color.BLUE);
  g2.draw(circle);
  
  for(int i=0; i<12; i++) {
   if(i%3 == 0)
    radius = 4;
   else
    radius = 2;
   double angle = Math.toRadians(90 - 30*i);
   x = centerX + circleR*Math.cos(angle);
   y = centerY - circleR*Math.sin(angle);
   circle.setFrameFromCenter(x, y, x+radius, y+radius);
   g2.fill(circle);
  }
  g2.setColor(Color.GRAY);
  g2.draw(new Line2D.Double(centerX, centerY, currentX, currentY));

 }

 

 public Insets getInsets() {
  return new Insets(20, 10, 10, 10);

 }

 

 public void myRepaint() {
  repaint();

 }
 public void start() {
  ActionListener jellen = new DrawEvent();
  Timer t = new Timer(1000, jellen);
  t.start();

 }

 

 private class DrawEvent implements ActionListener {
  double angle; 
  public void actionPerformed(ActionEvent event) {
   if(enabled) {
    totalAngle += 6;
    angle = Math.toRadians(90 - totalAngle);
    currentX = centerX + 100*Math.cos(angle);
    currentY = centerY - 100*Math.sin(angle);
    myRepaint();
   }
  }

 }

 

 private class ButtonPanel extends JPanel {
  boolean isStart = false;
  JButton start = new JButton(\"Start\");
  JButton reset = new JButton(\"Reset\");
  JButton quit = new JButton(\"Quit\");
  public ButtonPanel() {
   setBackground(Color.WHITE);
   add(start);
   add(reset);
   add(quit);
  
   StartEvent listenerS = new StartEvent();
   start.addActionListener(listenerS);
   reset.addActionListener(new 
    ActionListener() {
     public void actionPerformed(ActionEvent event) {
      totalAngle = 0;
      enabled = false;
      currentX = 150;
      currentY = 150;
      myRepaint();
      start.setText(\"Start\");
     }
    });
   quit.addActionListener(new 
    ActionListener() {
     public void actionPerformed(ActionEvent event) {
      System.exit(0);
     }
    });
  } 

 
    
  private class StartEvent implements ActionListener {
   public void actionPerformed(ActionEvent event) {
    isStart = !isStart;
    if(isStart) {
     start.setText(\"Pause\");
     enabled = true;
    } else {
     start.setText(\"Start\");
     enabled = false;
    }
   }
  }

 }
}
class MyFrame extends JFrame {

 public MyFrame() {
  setTitle(\"Jellen's Clock\");
  setSize(300, 400);
  setResizable(false);
  
  MyPanel panel = new MyPanel();
  getContentPane().add(panel);
  panel.start();

 }
}
public class Clock {

 public static void main(String[] args) {
  MyFrame frame = new MyFrame();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.show();

 }
}

[attach]370[/attach]

代码压缩文件。