本系统由 Lamp.java , LampController.java , Road.java 和MainClass.java组成.
    Lamp.java :
    package com.isoftstone.interview.traffic;
    public enum Lamp {
    //前进                              左拐                                  右拐
    S2N("N2S","S2W",false),          S2W("N2E","E2W",false),       S2E(null,null,true),
    E2W("W2E","E2S",false),         E2S("W2N","S2N",false),        E2N(null,null,true),
    N2S(null,null,false) ,          N2E(null,null,false),         N2W(null,null,true),
    W2E(null,null,false) ,         W2N(null,null,false),        W2S(null,null,true);
    String opposite;
    String next;
    boolean lighted;
    //构造函数:初始化当前灯
    private Lamp(String opposite,String next,boolean lighted){
    this.opposite = opposite;
    this.next = next;
    this.lighted = lighted;
    }
    //返回当前灯的状态
    public boolean isLighted(){return lighted;}
    public void light(){
    this.lighted = true;
    if(opposite != null){
    Lamp.valueOf(opposite).light();
    }
    System.out.println(name() + "is Green. Soon there will be cars crossed the street at six deractions.");
    }
    public Lamp blackout(){
    //关闭当前灯 : 设为false
    this.lighted = false;
    Lamp nextLamp = null;
    if(opposite != null){Lamp.valueOf(opposite).blackout();}
    //检查下一个灯并启动它
    if(next != null){
    nextLamp = Lamp.valueOf(next);
    System.out.println(name() + " to the " + next + " 's light is Green.");
    nextLamp.light();
    }
    return nextLamp;
    }
    }

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