LampController.java
    package com.isoftstone.interview.traffic;
    import java.util.concurrent.Executors;
    import java.util.concurrent.TimeUnit;
    public class LampController {
    private Lamp currentLamp;
    public LampController(){
    currentLamp = Lamp.S2N;
    currentLamp.light();
    //启动一个线程 : 每十秒将当前灯设置为红
    Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
    new Runnable() {
    public void run() {
    currentLamp = currentLamp.blackout();
    }
    },
    10,
    10,
    TimeUnit.SECONDS
    );
    }
    }
    Road.java
    package com.isoftstone.interview.traffic;
    import java.util.List;
    import java.util.ArrayList;
    import java.util.Random;
    import java.util.concurrent.Executors;
    import java.util.concurrent.TimeUnit;
    public class Road {
    private String name;
    private List<String> vehicles = new ArrayList<String>();
    public Road(String name){
    this.name = name;
    //模拟车辆不断随机上路的过程
    Executors.newSingleThreadExecutor().execute(new Runnable() {
    public void run() {
    for(int i = 0 ; i < 1000 ;i++){
    try {
    Thread.sleep((new Random().nextInt(10) + 1) * 1000);
    } catch (InterruptedException e) {
    e.printStackTrace();
    }
    vehicles.add(Road.this.name + "_" + i);
    }
    }
    });
    //每隔一秒检查对应的灯是否为绿，如果是 ,则放行一辆车,具体操作为从vehicles集合中移除第一辆车.
    Executors.newScheduledThreadPool(1).scheduleAtFixedRate(
    new Runnable() {
    public void run() {
    if(vehicles.size() > 0){
    if(Lamp.valueOf(Road.this.name).isLighted()){
    System.out.println(vehicles.remove(0) + " is traversing");
    }
    }
    }
    },
    1,
    1,
    TimeUnit.SECONDS);
    }
    }
    最后在Main方法中启动系统:public static void main(String[] args) {
    String[] deractions = {"S2N","S2W","E2W","E2S","N2S","N2E","W2E","W2N","S2E","E2N","N2W","W2S"};
    //模拟十二条方向的路线
    for(int i = 0 ; i < deractions.length; i++){
    new Road(deractions[i]);
    }
    //启动交通灯控制器
    new LampController();
    }

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