黑马程序员----java编程之交通灯管理系统

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模拟实现十字路口的交通灯管理系统逻辑，具体需求如下：

·        异步随机生成按照各个路线行驶的车辆。

例如：

       由南向而来去往北向的车辆---- 直行车辆

       由西向而来去往南向的车辆---- 右转车辆

       由东向而来去往南向的车辆---- 左转车辆

       。。。

·        信号灯忽略黄灯，只考虑红灯和绿灯。

·        应考虑左转车辆控制信号灯，右转车辆不受信号灯控制。

·        具体信号灯控制逻辑与现实生活中普通交通灯控制逻辑相同，不考虑特殊情况下的控制逻辑。

注：南北向车辆与东西向车辆交替放行，同方向等待车辆应先放行直行车辆而后放行左转车辆。

·        每辆车通过路口时间为1秒（提示：可通过线程Sleep的方式模拟）。

·        随机生成车辆时间间隔以及红绿灯交换时间间隔自定，可以设置。

·        不要求实现GUI，只考虑系统逻辑实现，可通过Log方式展现程序运行结果。

代码实现：

Road类

public class Road {private List<String> car=new ArrayList<String>();private String name=null;public Road(String name){this.name=name;ExecutorService pool= Executors.newSingleThreadExecutor();pool.execute(new Runnable(){@Overridepublic void run() {for(int i=0;i<1000;i++){try {Thread.sleep(new Random().nextInt(10)+1*1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}car.add(Road.this.name+"-"+i);}}});ScheduledExecutorService timer= Executors.newScheduledThreadPool(1);timer.scheduleAtFixedRate(new Runnable(){@Overridepublic void run() {if(car.size()>0){boolean lighted=Lamp.valueOf(Road.this.name).isLighted();if(lighted){System.out.println(car.remove(0)+" is traversing");}}}}, 1, 1, TimeUnit.SECONDS);}}

Lamp类

public enum Lamp { S2N("N2S","S2W",false),S2W("N2E","E2W",false),E2W("W2E","E2S",false),E2S("W2N","S2N",false), N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false), S2E(null,null,true),E2N(null,null,true),N2W(null,null,true),W2S(null,null,true);private boolean lighted;private String opposite;private String next;private Lamp(String opposite,String next,boolean lighted){this.opposite=opposite;this.next=next;this.lighted=lighted;}public boolean isLighted(){return lighted;}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！");}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类

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(){System.out.print("来啊");currentLamp=currentLamp.blackOut();}}, 10, 10, TimeUnit.SECONDS);}}

MainClass类

public class MainClass {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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