实现交通灯功能

这个功能的实现是经过观看张孝祥老师的视频后完成的。

视频下载地址：http://www.itheima.com/news/2012821/24cf70b28ae2.shtml

交通灯管理系统，主要有三个类，路Road  灯 Lamp    灯控制类 LampController

Road提供模拟汽车不断上路的过程  和  放行车辆的过程

Lamp提供灯光变换的功能

LampController 控制灯光的变换

package com.lihao.traffic;

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 {
    private List vechicles =new ArrayList();
	private String name=null;
	
	
	public Road(String name){
		this.name=name;
	//模拟汽车不断上路的过程
		ExecutorService pool = Executors.newSingleThreadExecutor();
		pool.execute(new Runnable(){

			@Override
			public void run() {
				for(int i=1;i<1000;i++){
					try {
						Thread.sleep((new Random().nextInt(10)+1)*1000);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					
					vechicles.add(Road.this.name+"_"+i);
				}
				
			}
			
		});
		
		//每隔一秒检查对应的灯是否为绿灯，如果是放行一辆车
		//在一秒之后，每隔一秒执行
		ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
		timer.scheduleAtFixedRate(
				new Runnable(){

					@Override
					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);
	}
	
	
}

package com.lihao.traffic;

public enum Lamp {
    E2W("W2E","S2N",false),S2N("N2S","E2S",false),E2S("W2N","S2W",false),S2W("N2E","E2W",false),
    W2E(null,null,false),N2S(null,null,false),W2N(null,null,false),N2E(null,null,false),
    E2N(null,null,true),N2W(null,null,true),W2S(null,null,true),S2E(null,null,true);
    
    
    
    private Lamp(String opposite,String next,boolean lighted){
    	this.opposite=opposite;
    	this.next=next;
    	this.lighted=lighted;
    }
    
    private String opposite;
    private String next;
    private boolean lighted;
    public boolean isLighted(){
    	return lighted;
    }
    
    //某个灯变绿时，对应的灯也变绿
    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个方向会有车辆行驶！！");
    }
    
    //某个灯变红时，对应的灯也变红，下个灯变亮
    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;
    }
}

package com.lihao.traffic;

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.E2W;
		currentLamp.light();
		
		//红灯绿灯间隔时间为10秒
		ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
		timer.scheduleAtFixedRate(
				new Runnable(){
					public void run(){
						
						currentLamp = currentLamp.blackOut();
					}
				}, 
				10, 
				10, 
				TimeUnit.SECONDS);
	}
}