交通灯管理系统-张孝祥

1、红绿灯        12条路线，12盏灯（枚举）
2、红绿灯控制器
3、汽车（看到路线上的灯）（第一个车才过路口）（问路上前面是否有车）
      （并不体现车辆过程，只是捕捉到车的增加与减少，所以车不一定要设计为一个单独的类）

4、路线（与灯绑定）（所以路上有好多车）（路上有增加车辆和减少车辆的方法）

Road.java

package com.cn.duduyu.traffic;import java.util.ArrayList;import java.util.List;import java.util.Random;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;/** * 12条路线 * @author Charles.Dee * @description <br> * @time 2014-10-9  上午10:04:55 * @type com.cn.duduyu.traffic.Road.java */public class Road {private List<String> vechicles=new ArrayList<String>();private String name=null;//车的名字要由路线public Road(String name){this.name=name;//模拟车辆不断随机上路的过程ExecutorService pool = Executors.newSingleThreadExecutor();pool.execute(new Runnable(){public void run(){for(int i=1;i<1000;i++){try {Thread.sleep((new Random().nextInt(10) + 1) * 1000);} catch (InterruptedException e) {e.printStackTrace();}//内部类访问外部类的成员变量，如果成员变量名称与本身局部变量名称冲突，需要Road.this.namevechicles.add(Road.this.name + "_" + i);}}});//每隔一秒检查对应的灯是否为绿，是则放行一辆车ScheduledExecutorService timer =  Executors.newScheduledThreadPool(1);timer.scheduleAtFixedRate(new Runnable(){public void run(){if(vechicles.size()>0){//内部类访问外部类的成员变量，如果成员变量名称与本身局部变量名称冲突，需要Road.this.nameboolean lighted = Lamp.valueOf(Road.this.name).isLighted();if(lighted){System.out.println(vechicles.remove(0) + " is traversing !");}}}},1,// initialDelay（过好久开始执行）1,// period  （每隔多久执行一次）TimeUnit.SECONDS);}}

Lamp.java

package com.cn.duduyu.traffic;public enum Lamp {/*每个枚举元素各表示一个方向的控制灯*/S2N("N2S","S2W",false),S2W("N2E","E2W",false),E2W("W2E","E2S",false),E2S("W2N","S2N",false),/*下面元素表示与上面的元素的相反方向的灯，它们的“相反方向灯”和“下一个灯”应忽略不计！*/N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false),/*由南向东和由西向北等右拐弯的灯不受红绿灯的控制，所以，可以假想它们总是绿灯*/S2E(null,null,true),E2N(null,null,true),N2W(null,null,true),W2S(null,null,true);//ambiguousprivate Lamp(Lamp opposite,boolean lighted,Lamp next){}//变量必须先定义后使用，直接传灯的话，开始没有定义，所以话导致出错//枚举的构造方法必须是私有的private Lamp(String opposite,String next,boolean lighted){this.opposite = opposite;this.next = next;this.lighted = lighted;}private Lamp(){}/*当前灯是否为绿*/private boolean lighted;//true-绿  false-红/*与当前灯同时为绿的对应方向*/private String opposite;/*当前灯变红时下一个变绿的灯*/private String next;public boolean isLighted(){return lighted;}/** * 某个灯变绿时，它对应方向的灯也要变绿 */public void light(){this.lighted=true;if(opposite!=null){Lamp.valueOf(opposite).light();}System.out.println(name() + " lamp is green，下面总共应该有6个方向能看到汽车穿过！");}/** * 某个灯变红时，对应方向的灯也要变红，并且下一个方向的灯要变绿 * @return 下一个要变绿的灯 */public Lamp blackOut(){this.lighted = false;if(opposite != null){Lamp.valueOf(opposite).blackOut();}Lamp nextLamp= null;if(next != null){nextLamp = Lamp.valueOf(next);System.out.println("绿灯从" + name() + "-------->切换为" + next);nextLamp.light();}return nextLamp;}}

LampController.java

package com.cn.duduyu.traffic;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class LampController {//当前灯（绿灯）private Lamp currentLamp;public LampController(){//将S2N的灯初始为绿灯currentLamp=Lamp.S2N;currentLamp.light();/*每隔10秒将当前绿灯变为红灯，并让下一个方向的灯变绿*/ScheduledExecutorService timer =  Executors.newScheduledThreadPool(1);timer.scheduleAtFixedRate(new Runnable(){public  void run(){System.out.println("来啊");currentLamp = currentLamp.blackOut();//把当前等变红，且将next灯（已变绿的灯）当作当前灯}},10,//initialDelay（过好久开始执行）10,//period  （每隔多久执行一次）TimeUnit.SECONDS);}}

ClientMain.java

package com.cn.duduyu.traffic;public class ClientMain {public static void main(String[] args) {/*产生12个方向的路线*/String [] directions = new String[]{"S2N","S2W","E2W","E2S","N2S","N2E","W2E","W2N","S2E","E2N","N2W","W2S"};/* * 产生12条路线，在产生路线的时候，会随机产生各个方向的车辆 * 并且会模拟汽车过路口 */for(int i=0;i<directions.length;i++){new Road(directions[i]);}/*产生整个交通灯系统*//* * 在LampController里面控制灯的变换 */new LampController();}}