clock.java

有关java的源程序,为讲授java程序设计课程使用

import java.awt.*;
import java.applet.*;
import java.util.*;
public class clock extends Applet implements Runnable
{
   Thread clockThread=null;
   Label time;
   public void  init()
   {
	time=new Label((new Date()).toString());
	add(time);
	validate();
   }
   public void start()
    {
        if(clockThread==null)
    	  {
		clockThread=new Thread(this,"clock");
		clockThread.start();
          }		
    }
    public void stop()
    {
      clockThread=null;
    }
    public void run()
    {
        while(Thread.currentThread()==clockThread)
 	{
                Date now=new Date();
		time.setText(now.toString());
                if(now.getSeconds() %10==0)
		   callSchedular();
		try
		{
		   clockThread.sleep(1000);	
		}
		catch(InterruptedException e)
		{
		}
	}
    }
    void callSchedular()
    {
        Applet schedular=getAppletContext().getApplet("schedular");
	if(schedular !=null)
	 {
 	   ((Schedular)schedular).startCar();
	 }
    }
}