//show.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.text.*;
import java.util.*;
public class show extends JFrame implements Runnable
{
 static JFrame jf;
 JLabel jl;
 public show()
 {
  jf=new JFrame("時間顯示");
  jl=new JLabel();
  jf.getContentPane().add(jl);
  jf.setSize(200,100);  
 }
 
 public void run()
 {
  while(true)
  {
   SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
   jl.setText(sdf.format(new Date()));
   try
   {
    Thread.sleep(1000); 
   }
   catch(Exception e)
   {
    jl.setText("出錯錯誤，請重啟程序");
   }
  }  
 } 
 public static void main(String arg[])
 {
  show t=new show();
  Thread thread1=new Thread(t);
  thread1.start();  
  jf.setVisible(true);  
 } 
}