java交通信号灯

import java.applet.Applet;import java.awt.*;import java.awt.Color;

public class LX8_10 extends Applet{

dxx td;nbx td2;jt a=new jt();String xhd="东西灯";

Graphics g;int x1=0,y1=220;

public void init(){setForeground(Color.white);}

public void start(){

if(td==null)td=new dxx(a);td.start();

if(td2==null)td2=new nbx(a);td2.start();}

public void stop(){td=null;td2=null;}

public void update(Graphics g){paint(g);}

public void paint(Graphics g){

g.fillRect(0,100,300,100);

g.fillRect(100,0,100,300);g.setColor(Color.red);

g.drawString("南北行",110,300-y1);

g.drawString("南北行",160,y1);

g.drawString("东西行",280-x1,120);

g.drawString("东西行",x1,180);

if(xhd=="东西灯")a.qh(100,100,"红","绿",g);

if(xhd=="南北灯")a.qh(100,100,"绿","红",g);

if(xhd=="黄灯")a.qh(100,100,"黄","黄",g);}

class jt{

int x,y;String 颜色1,颜色2,d;int 显示时间;

public void qh(int x1,int y1,String c1,String c2,Graphics g){

x=x1;y=y1;颜色1=c1;颜色2=c2;

for(int i=0;i<3;i++){

if(颜色1=="黄")g.setColor(Color.yellow);

if(颜色1=="红")g.setColor(Color.red);

if(颜色1=="绿")g.setColor(Color.green);

g.fillOval(x+i*15,y,15,15);

g.fillOval(x+55+i*15,y+85,15,15);

if(颜色2=="黄")g.setColor(Color.yellow);

if(颜色2=="红")g.setColor(Color.red);

if(颜色2=="绿")g.setColor(Color.green);

g.fillOval(x+85,y+i*15,15,15);

g.fillOval(x,y+55+i*15,15,15);}}}

class dxx extends Thread{

private jt a1;

public dxx(jt a){a1=a;}

public void run(){

for(int j=0;j<100+j;j++)

synchronized(a1){for(int i=0;i<100;i++){x1+=5;repaint();if(x1==285)

x1=0;

try{Thread.sleep(100);}catch(InterruptedException e){} }

xhd="黄灯";repaint();try{Thread.sleep(400);}

catch(InterruptedException e){}

xhd="南北灯";x1=70;repaint();try{Thread.sleep(400);}catch(InterruptedException e){}

}

}

}

class nbx extends Thread{

private jt a1;

public nbx (jt a){a1=a;}

public void run(){

for(int j=0;j<100+j;j++){

synchronized(a1){for(int i=0;i<100;i++){y1+=5;repaint();if(y1==285) y1=0;

try{Thread.sleep(50);}catch(InterruptedException e){}}

xhd="黄灯";repaint();try{Thread.sleep(400);}catch(InterruptedException e){}

xhd=”东西灯”;y1=220;repaint();try{Thread.sleep(400);}catch(InterruptedException e){}}

}}}}