applet1.java

模拟时钟的运行程序

import java.applet.Applet;
import java.awt.*;
import java.math.*;
public class Applet1 extends Applet
{
	double j,k,l;
	public void paint(Graphics g)
	{
		g.drawOval(60,60,60,60);
		for(double i=0;i<2*Math.PI;i+=Math.PI/6)
			g.drawLine((int)(90+Math.cos(i)*22),(int)(90+Math.sin(i)*22),(int)(90+Math.cos(i)*27),(int)(90+Math.sin(i)*27));
		g.drawLine((int)(90-3*Math.cos(j)),(int)(90-3*Math.sin(j)),(int)(90+20*Math.cos(j)),(int)(90+20*Math.sin(j)));
		g.fillOval(88,88,4,4);	
		g.drawLine(90,90,(int)(90+18*Math.cos(k)),(int)(90+18*Math.sin(k)));
		g.drawLine(90,90,(int)(90+14*Math.cos(l)),(int)(90+14*Math.sin(l)));
		
		j+=Math.PI/600;
		if(j>2*Math.PI)j-=2*Math.PI;
		k+=Math.PI/36000;
		if(k>2*Math.PI)k-=2*Math.PI;
		k+=Math.PI/43200;
		if(k>2*Math.PI)k-=2*Math.PI;
		try{
			Thread.sleep(50);
		}
		catch(InterruptedException e)
		{
			showStatus(e.toString());
		}
		repaint();
	}
	public void init()
	{
		j=Math.PI*3/2;
		k=Math.PI*3/23;
	}				 
	public void start()
	{
		j=Math.PI*1.55;
		k=Math.PI*1.6;
		l=1;
	}
}