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

public class Miao extends JFrame implements ActionListener
{
 JButton button1;
 JButton button2;
 JTextField  tf;
 JPanel panel;
    Timer time;
    int shu=0;
    int miao=0;
    int minute=0;
    int hour;
    int day;
    int year;
    int century;
    JLabel label;
 

 /**
  * Method actionPerformed
  *
  *
  * @param e
  *
  */
  public Miao()
  {
   
   
   this.xian();
   this.addlistener();
   
  }
  public void xian()
  {
   panel = new JPanel();
   time         = new Timer(1,this);
   label = new JLabel("0");
   this.button1 = new JButton("开始");
   this.button2 = new JButton("停止");
   this.tf      = new JTextField(30);
   panel.add(label);
   System.out.println ("label-width"+this.label.getWidth()+"");
   System.out.println ("label-height"+this.label.getHeight()+"");
   panel.add(tf);
   panel.add(this.button1);
   panel.add(this.button2);
   this.getContentPane().add(panel);
   this.setBounds(200,20,350,350);
   this.setVisible(true);
   this.setTitle("计数器");
  }
  public void addlistener()
  {
   this.button1.addActionListener(this);
   this.button2.addActionListener(this);
     // time.addActionListener(this);
 
  }
 
 public void actionPerformed(ActionEvent e)
 {
  // TODO: Add your code heree.getSource()==this.button1
 
  if(e.getSource()==this.button1)
  {
   System.out.println ("开始");
   this.shu=0;
   this.miao=0;
   this.minute=0;
   this.hour=0;
   this.day=0;
   this.year=0;
   this.century=0;
   this.tf.setText(0+"");
   time.start();
      
  }
  if(e.getSource()==this.button2)
  {
   System.out.println ("停止");
   time.stop();
  }
  if(e.getSource()==time)
  {
 // System.out.println ("time");
  this.shu++;
 // System.out.println (shu);
 
 
   this.tf.setText(this.century+"世纪"+this.year+"年"+this.day+"日"+this.hour+":"+minute+":"+miao+":"+shu+"");
   //label.setText(shu+"");
   if(shu%100==0)
   {
    this.shu=0;
    this.miao++;
   // tf.setText(minute+":"+miao+":"+shu);
    System.out.println ("label-width"+this.label.getWidth()+"");
     System.out.println ("label-height"+this.label.getHeight()+"");
     if(this.miao%60==0)
     {
      this.miao=0;
      this.minute++;
      if(this.minute%60==0)
      {
       this.minute=0;
       this.hour++;
       if(this.hour%24==0)
       {
        this.hour=0;
        this.day++;
        if(this.day%365==0)
        {
         this.year++;
         this.day=0;
         if(this.year%100==0)
         {
          this.year=0;
          this.century++;
         }
        }
       }
      }
      
     }
   }
 
  
  
  }
  
 }
 public static void main(String as[])
  {
   new Miao();
  }
}