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

/**
 * 处理时间的类
 */
public class ClockAnimate extends JPanel
 implements Runnable {

 private volatile Thread thread;
 long startTime = 0l; //开始时间
 long usedTime = 0l; //使用时间

 Color color = new Color(212, 255, 200);
 Font font48 = new Font("serif", Font.PLAIN, 28);
 java.text.DecimalFormat df = new java.text.DecimalFormat("000");
 java.text.DecimalFormat df2 = new java.text.DecimalFormat("0");

 public ClockAnimate() {
  this.setMinimumSize(new Dimension(156, 48));
  this.setPreferredSize(new Dimension(156, 48));
 }

 /**
  * 时间的绘制
 */
 public void paint(Graphics g) {
  Graphics2D g2 = (Graphics2D) g;
  Dimension d = getSize();
  g2.setBackground(new Color(111, 146, 212));
  g2.clearRect(0, 0, d.width, d.height);
  g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
       RenderingHints.VALUE_ANTIALIAS_ON);
  g2.setColor(color);
  g2.setFont(font48);

  g2.drawString("时间:" + getTime(), 16, 40);
 }

 /**
  * 取得使用时间格式化后的字符串
 */
 String getTime() {
  int sec, ms;
  long time;
  time = usedTime;
  sec = Math.round(time / 1000);
  time -= sec * 1000;
  ms = Math.round(time / 100);
  return (df.format(sec) + "." + df2.format(ms));
 }

 public void start() {
  startTime = System.currentTimeMillis();
  thread = new Thread(this);
  thread.start();
 }

 public void run() {
  Thread currentThread = Thread.currentThread();
  while (thread == currentThread) {
   long time = System.currentTimeMillis();
   usedTime = time - startTime;
   try {
    repaint();
    thread.sleep(100l);
   }
   catch (InterruptedException ex) {
   }
  }
 }

 public void stop() {
  if (thread != null) {
   thread = null;
  }
 }

 /**
  * 取得用户使用的时间
 */
 public int getUsedTime() {
  return Math.round(usedTime / 1000);
 }}

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