package hotel2;import java.awt.*;import javax.swing.JLabel;import java.util.*;import java.text.DateFormat;/** * <p>Title: 客房官理系統</p> * <p>Description: </p> * <p>Copyright: Copyright (c) 2004</p> * <p>Company: </p> * @author 楊淳 * @version 1.0 */public class Clocklabel extends JLabel implements Runnable{  private Thread clockthread=null;      public Clocklabel()     {      if(clockthread==null)         {           clockthread=new Thread(this,"clock");           clockthread.start();          }      }       public void run()        {          while(true)            {              Calendar cal=Calendar.getInstance();              Date date=cal.getTime();              DateFormat dateformatter=DateFormat.getTimeInstance();              this.setText(dateformatter.format(date));              try{                  Thread.sleep(1000);                 }              catch(Exception e){}            }         }}