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Java高级——交通灯管理系统
本方法模拟了现实生活中的交通信号灯的情况
1.先构建Road类，此类可以创建12个方向的路
代码如下：
1 package com.springtie.traffic; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 import java.util.Random; 6 import java.util.concurrent.ExecutorService; 7 import java.util.concurrent.Executors; 8 import java.util.concurrent.ScheduledExecutorService; 9 import java.util.concurrent.TimeUnit;10 11 public class Road {12 // 12个方向的路名13 private String roadname;14 // 存储车辆的集合15 private List<String> vehicle = new ArrayList<String>();16 17 // 根据每个方向的不同创建不同的路名18 public Road(String roadname) {19 this.roadname = roadname;20 // 向当前路添加1000辆车21 ExecutorService pool = Executors.newSingleThreadExecutor();22 pool.execute(new Runnable() {23 public void run() {24 try {25 Thread.sleep((new Random().nextInt(10) + 1) * 1000);26 } catch (InterruptedException e) {27 e.printStackTrace();28 }29 for (int car = 0; car < 1000; car++) {30 // 把车辆添加进来31 vehicle.add(roadname + "方向的车辆" + car);32 // System.out.println(roadname+"方向的车辆"+car+"正在开过来");33 }34 }35 });36 // 当前路上的，灯位绿色的，使其最前面的车辆1秒后穿越马路，再过一秒后上来的最前面车辆穿越马路，如此循环，知道灯变红37 ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);38 timer.scheduleAtFixedRate(new Runnable() {39 public void run() {40 if (!vehicle.isEmpty()) {41 boolean lampState = Lamp.valueOf(roadname).isLighted();42 if (lampState) {43 44 System.out.println(vehicle.remove(0) + "穿越马路");45 }46 }47 }48 }, 1, 1, TimeUnit.SECONDS);49 }50 }
2.创建交通灯枚举Lamp，通过私有构造函数传入当前灯的对应灯和下一个灯以及当前的状态
代码如下：
1 package com.springtie.traffic; 2 3 public enum Lamp { 4 // 12个信号灯枚举对象 5 S2N("N2S", "S2W", false), S2W("N2E", "E2W", false), E2W("W2E", "E2S", false), E2S( 6 "W2N", "S2N", false), N2S(null, null, false), N2E(null, null, false), W2E( 7 null, null, false), W2N(null, null, false), S2E(null, null, true), E2N( 8 null, null, true), N2W(null, null, true), W2S(null, null, true); 9 // 枚举私有成员变量10 private String oppositeLamp;11 private String nextLamp;12 private boolean lampState;13 14 // 私有构造函数15 private Lamp(String oppositeLamp, String nextLamp, boolean lampState) {16 this.oppositeLamp = oppositeLamp;17 this.nextLamp = nextLamp;18 this.lampState = lampState;19 }20 21 // 判断是红灯还是绿灯22 public boolean isLighted() {23 return lampState;24 }25 26 // 让灯变绿，对应灯也变绿27 public void turnGreen() {28 this.lampState = true;29 if (oppositeLamp != null) {30 Lamp.valueOf(oppositeLamp).turnGreen();31 }32 System.out.println("灯：" + this.name() + "为绿灯，+对应等和其他四个灯也为绿灯");33 }34 35 // 让灯和对应灯变红，同时让下一个灯变绿，返回下一个灯36 public Lamp turnRed() {37 this.lampState = false;38 if (oppositeLamp != null) {39 Lamp.valueOf(oppositeLamp).turnRed();40 }41 Lamp next = null;42 if (nextLamp != null) {43 next = Lamp.valueOf(nextLamp);44 System.out.println("绿灯：" + this.name() + " 切换为：" + next.name());45 next.turnGreen();46 }47 return next;48 }49 }
3.创建灯控系统类LampController，利用此类来控制灯变量的顺序
代码如下：
1 package com.springtie.traffic; 2 3 import java.util.concurrent.Executors; 4 import java.util.concurrent.ScheduledExecutorService; 5 import java.util.concurrent.TimeUnit; 6 7 public class LampController { 8 private Lamp currentLamp; 9 10 public LampController() {11 currentLamp = Lamp.S2N;12 // 让当前灯变绿13 currentLamp.turnGreen();14 // 单开一个线程，当前灯变红的同时下个等变绿，一直重复15 ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);16 timer.scheduleAtFixedRate(new Runnable() {17 public void run() {18 System.out.println("当前灯变红时，返回下个灯并让其变绿");19 currentLamp = currentLamp.turnRed();20 }21 }, 10, 10, TimeUnit.SECONDS);22 }23 }
4.创建一个主类（MainClass）来测试
代码如下：
1 package com.springtie.traffic; 2 3 public class MainClass { 4 5 public static void main(String[] args) { 6 // 代表12条路的方向 7 String[] directionRoadName = new String[] { "S2N", "S2W", "E2W", "E2S", 8 "N2S", "N2E", "W2E", "W2N", "S2E", "E2N", "N2W", "W2S" }; 9 // 把12条路的线程启动10 for (int i = 0; i < directionRoadName.length; i++) {11 new Road(directionRoadName[i]);12 }13 // 调用灯控系统14 new LampController();15 }16 17 }
至此，一个完整的模拟现实生活中的交通灯管理系统构建完毕。
Java高级——交通灯管理系统
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