黑马程序员————学习日记【15】 【交通灯管理系统】

------- android培训、java培训、期待与您交流！ ----------

 

一、项目需求： 

 

二、画图描述：

 

 

 三、思路分析：

 

四、代码实现步骤：

 

1、Road类的编写

package com.isoftstone.interview.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;/*  每个Road对象代表一条路线，总共有12条路线，即系统中总共要产生12个Road实例对象。  每条路线上随机增加新的车辆，增加到一个集合中保存。  每条路线每隔一秒都会检查控制本路线的灯是否为绿，是则将本路线保存车的集合中的第一辆车移除，即表示车穿过了路口。 */public class Road {private List<String> vechicles = new ArrayList<String>();private String name =null;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();}vechicles.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){boolean lighted = Lamp.valueOf(Road.this.name).isLighted();if(lighted){System.out.println(vechicles.remove(0) + " is traversing !");}}}},1,1,TimeUnit.SECONDS);}}

 

 2、Lamp类的编写

package com.isoftstone.interview.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);private Lamp(String opposite,String next,boolean lighted){this.opposite = opposite;this.next = next;this.lighted = lighted;}//当前灯是否为绿private boolean lighted;//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;}}

 

3、LampController类的编写 

package com.isoftstone.interview.traffic;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;public class LampController {private Lamp currentLamp;public LampController(){//刚开始让由南向北的灯变绿;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();}},10,10,TimeUnit.SECONDS);}}

 4、MainClass类的编写

package com.isoftstone.interview.traffic;public class MainClass {/**@param args*/ 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"};for(int i=0;i<directions.length;i++){new Road(directions[i]);}//产生整个交通灯系统new LampController();}}