myapplet.java

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package com.applet;
import javax.swing.*;
import java.awt.*;

public class MyApplet extends JApplet{
	private long s_red;
	private long s_orange;
	private long s_green;
	private int count=1;
	
	private int radius=50;
	private int step=55;
	private int y=30;
	private int x=50;
	
	public void init(){
		try{
		    s_red=Integer.parseInt(getParameter("red"));
		    s_orange=Integer.parseInt(getParameter("orange"));
		    s_green=Integer.parseInt(getParameter("green"));
		    count=Integer.parseInt(getParameter("count"));
		}catch(Exception e){
			s_red=1000;
			s_orange=1000;
			s_green=1000;
			count=1;
		}
	}
	public void paint(Graphics g){
        String text[]={"红","黄","绿"};
		g.setFont(new Font("宋体",1,12));
		g.drawString("红灯停留时间："+s_red/1000,50,100);
		g.drawString("黄灯停留时间："+s_orange/1000,50,120);
		g.drawString("绿灯停留时间："+s_green/1000,50,140);
		g.drawString("循环次数："+count,50,160);
		
		g.setColor(Color.lightGray);
        for(int i=0;i<3;i++){
        	g.drawString(text[i], x+i*step+20, 20);
        	g.fillOval(x+i*step, y, radius, radius);
        }
        run(g);
	}
	private void run(Graphics g){
		Graphics clear=g;
		Color color[]={Color.red,Color.orange,Color.green};
		long s_wait[]={s_red,s_orange,s_green};
		int i=0;
        try{
        	synchronized(this){
			   for(i=0;i<count;i++){
				   for(int j=0;j<3;j++){
				     g.setColor(color[j]);
		             g.fillOval(x+j*step, y, radius, radius);
		             this.wait(s_wait[j]);
		             clear.setColor(Color.lightGray);
				     clear.fillOval(x+j*step, y, radius, radius);
				   }
			   }
			}
			g.drawString("No electricity!!",50,180);
        }catch(Exception e){
        	e.printStackTrace();
        }
	}
}