黑马程序员--Java7K破解题---交通灯

来源：互联网发布：北交大知行编辑：程序博客网时间：2024/06/01 09:16

切不可空想，一定要画图！
面向对象：红绿灯、红绿灯的控制系统、汽车、路线。
面向对象的重要经验：谁拥有数据，谁就对外提供操作这些数据的方法。
例子：人在黑板上画圆。（person、blackboard,circle三个对象，画圆的动作存在圆上面。
小球从绳子的一端滚到另一端的面向对象设计：

class Rope{     private Point start;     private Point end;     public Rope(Point start,Point end){this.start=start;this.end=end;      }      public Point nexPoint(Point currentPoint){}}class Ball{Private Rope rope;private Point currentPoint;public Ball(Rope rope,startPoint){this.rope=rope;this.currentPoint=statPoint;}public void move(){currentPoint=rope.nextPoint(currentPoint);System.out.prrintln("小球移动到了"+currentPoint);}}

Lamp类表示一个交通灯。（12灯。）使用枚举创建。

public enum Lamp {S2N("N2S",false,"S2W"),S2W("N2E",false,"E2W"),E2W("W2E",false,"E2S"),E2S("W2N",false,"S2N"),S2E("N2W",true,"S2E"),E2N("W2S",true,"E2n"),N2S(null,false,null),N2E(null,false,null),W2E(null,false,null),W2N(null,false,null),N2W(null,false,null),W2S(null,false,null);private Lamp(String opposite,boolean lighted,String next){this.opposite=opposite;this.next=next;this.lighted=lighted;}private Lamp(){};private boolean lighted;private String opposite;private String next;public boolean isLighted(){return lighted;}public void light(){this.lighted=true;if(opposite !=null){Lamp.valueOf(opposite).light();//opposite.light();}System.out.println(name()+"lamp is green 下面有六路车通过");}public Lamp blackOut(){this.lighted=false;if(opposite !=null){Lamp.valueOf(opposite).blackOut();//opposite.light();}Lamp nextLamp=null;if (next !=null){nextLamp=Lamp.valueOf(next);System.out.println("l绿灯从"+name()+"----->切换为"+next);nextLamp.light();}return nextLamp;}}

线路的代码：

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;public class Road {privateList<String> vechicles=new ArrayList<String>();private String name=null;public Road(String name){this.name=name;ExecutorService pool=Executors.newSingleThreadExecutor();//创建线程。pool.execute(new Runnable(){public void run(){for(int i=1;i<1000;i++){try {Thread.sleep((new Random().nextInt(10)+1)*1000);//随机产生车。} catch (InterruptedException e) {// TODO Auto-generated catch blocke.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==true){System.out.println(vechicles.remove(0)+"  is travling");}}}},1, 1, TimeUnit.SECONDS);}}

交通灯控制器代码：

import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;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();}},10,10,TimeUnit.SECONDS);}}

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