package pack1;

 /**

  * 灯线程

  * @author Administrator

  *

  */

 public class Lighter extends Thread{

 //代表灯当前的状态（这里只考虑红绿两种状态）

 public String state;

 public void run(){

     while (true){

         try {

             //初始状态设为红灯，且红灯时常为10s

             state = "red";

             System.out.println("lighter:现在是红灯，静止车辆通行");

             Thread.sleep(10*1000);

             //10s后灯变绿，设绿灯时间位5秒

             state = "green";

             System.out.println("lighter:现在变绿灯了，车辆可以通行了。");

             Lighter.sleep(5*1000);

         } catch (InterruptedException e) {

             System.out.println("出错了:"+e);

         }

     }

 }

 }

package pack1;

/**

 * 车辆线程

 * @author Administrator

 *

 */

public class Car extends Thread{

String name="";

//灯作为私有变量，车辆根据灯的状态决定是否要停止

private Lighter lighter;

public Car(String name,Lighter l){

    this.name=name;

    this.lighter=l;

}

public void run(){

    if (lighter.state.equals("red")){

        System.out.println(this.name+":等待中");

    }else{

        System.out.println(this.name+":通过了红绿灯");

    }

}

}

 package pack1;

 /**

  * 红绿灯测试代码

  * @author Administrator

  *

  */

 public class RglightTest {

 public static void main(String[] args) throws InterruptedException {

     Lighter l=new Lighter();

         //红绿灯开始运行

     l.start();

         //生成20个车辆，依次通过红绿灯

     for(int i=0;i<20;i++){

         Car c=new Car("car"+i+1,l);

                 //当前车辆睡眠1s

         c.sleep(1000);

         c.start();

     }

 }

 }