java张孝祥（6） 交通灯管理系统

这个项目要是给我来写，我一定没有张老师写的好，之前没涉及过枚举类，不会使用，通过老师的讲解，以及分析思路，让我更加明白业务逻辑。
看来去黑马学习一定没有错，我一定要成为黑马的一员。
下面是老师的代码，我加以注释。
Lamp.java

package com.ici.interview.traffic;

public enum Lamp {
/* 创建12中路线的灯，以及设定他们相关联的上下灯，并设定灯的当前状态是否为绿灯*/
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);
/* 灯的构造方法，参数为 上一个灯，下一个灯，当前是否为绿*/
private Lamp(String oppoite,String next,boolean lighted){
this.opposite = oppoite;
this.next = next;
this.lighred = lighted;
}
private boolean lighred;
private String opposite;
private String next;
/* 返回当前灯是否为绿*/
public boolean isLighted(){
return lighred;
}
//开灯
public void light(){
this.lighred = true;
if(opposite!=null){
Lamp.valueOf(opposite).light();
}
System.out.println(name() + " Lamp is green !");
}
//关灯
public Lamp blackOut(){
this.lighred = true;
if(opposite!=null){
Lamp.valueOf(opposite).blackOut();
}
//注意这里要设置为空不要赋值
Lamp nextLamp = null;
if(next!=null){
System.out.println("绿灯从 " +name()+ " 切换为 " +next);
nextLamp = Lamp.valueOf(opposite);
Lamp.valueOf(opposite).light();
}
return nextLamp;
}
}

Road.java

package com.ici.interview.traffic;

import java.util.ArrayList;
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 {
private ArrayList<String> vechicles = new ArrayList<String>();

private String name = null;
public Road(String name){
this.name = name;

ExecutorService pool =Executors.newSingleThreadExecutor();
//启动一个线程
pool.execute(new Runnable() {
public void run() {
for (int i=0; i<1000; i++) {
try {
Thread.sleep((new Random().nextInt(5)+1) * 1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
vechicles.add(Road.this.name+ "_" + i);
}
}
});

//定时器
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);
}
}

Main.java

package com.ici.interview.traffic;

public class Main {
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();
}
}

LampController.java

package com.ici.interview.traffic;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class LampController {
private Lamp currentLamp;
//交通灯控制器，设置换灯时间。
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);
}
}