黑马程序员-------交通灯管理系统

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面向对象的分析与设计

谁拥有数据，谁就对外提供操作这些数据的方法。

 

Lamp类的编写

package com.itcast;public enum Lamp {S2N("N2S","S2W",false),S2W("N2S","S2W",false),E2W("W2E","E2S",false),E2S("W2N","S2N",false),S2E(null,null,true),E2N(null,null,true),N2W(null,null,true),W2S(null,null,true),N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false);private String  opposite;private boolean lighted;private String next;private Lamp(String opposite,String next,boolean lighted){this.opposite=opposite;this.next=next;this.lighted=lighted;}public void light(){this.lighted=true;if(opposite!=null){Lamp.valueOf(opposite).light();}System.out.println(name()+"绿了");  }public boolean isLighted(){return lighted;}public Lamp blackOut(){this.lighted=false;if(opposite!=null){Lamp lampOpposite =Lamp.valueOf(opposite);lampOpposite.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;}}

lLampController类的编写

lLampController构造方法中要设定第一个为绿的灯。

lLampController对象的start方法中将当前灯变绿，然后启动一个定时器，每隔10秒将当前灯变红和将下一个灯变绿。

public class LampController {private Lamp currentLamp ;public  LampController(){currentLamp =Lamp.S2N;currentLamp.light();ScheduledExecutorService timer =  Executors.newScheduledThreadPool(1);timer.scheduleAtFixedRate(new Runnable(){public  void run(){currentLamp = currentLamp.blackOut();}},6,6,TimeUnit.SECONDS);}}

lRoad类的编写

l每个Road对象都有一个name成员变量来代表方向，有一个vehicles成员变量来代表方向上的车辆集合。

l在Road对象的构造方法中启动一个线程每隔一个随机的时间向vehicles集合中增加一辆车（用一个“路线名_id”形式的字符串进行表示）。

l在Road对象的构造方法中启动一个定时器，每隔一秒检查该方向上的灯是否为绿，是则打印车辆集合和将集合中的第一辆车移除掉。

 

public class Road {private List<String> vechicles = new ArrayList<String>();private String name =null; ;public Road (String name){this.name = name;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);}}});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);}}

 

lMainClass类的编写

l用for循环创建出代表12条路线的对象。

l接着再获得LampController对象

 

public class MainClass {/** * @param args */public static void main(String[] args) {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]);}new LampController();}}

 

 

 

 

 

 

 

 

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