黑马程序员--7K：路灯系统

---------------------- ASP.Net+Android+IOS开发、.Net培训、期待与您交流！ ----------------------

1.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


2。示例代码：
Road：
package PilotLamp;


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


/*
 * 1.内部类访问外部变量时外部变量“name”需要添加final
 * 2.内部变量访问外部变量时内部变量则"类名。this。name"
 */
public class Road {
List<String> vechicles = new ArrayList<String>();

private String name = null; //道路名称
public Road(String name){
this.name = name;

//"Executors"执行器，一个类用添加"s"表示这个类提供静态方法
//"newSingleThreadExecutor"表示产生单个线程
//"newScheduledThreadPool"表示产生池
ExecutorService pool = Executors.newSingleThreadExecutor();
pool.execute(new Runnable() { //表示任务交给池，而池则将提供一个空闲线程去执行

@Override
public void run() {
// TODO Auto-generated method stub
//在构造方法中创建车
for(int i = 1; i < 1000; i++){
try {
//Thread.sleep(1000); //每隔一秒则产生一辆汽车
Thread.sleep((new Random().nextInt(10) + 1) * 1000); //表示从一到十秒内随机出现的一辆车
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
vechicles.add(Road.this.name + "_" + i); //1.某条路上的车；
}
}
});

ScheduledExecutorService time = Executors.newScheduledThreadPool(1);
time.scheduleAtFixedRate(new Runnable(){
public void run(){
if(vechicles.size() > 0){ //表示有车时
boolean lighted = Lamp.valueOf(Road.this.name).isLighted();
if(lighted){
System.out.println(vechicles.remove(0)  +" "+ "is travesing");
}

}
}
}, 
1, //过多少秒时开始
1, //任务结束到下次开始时的时间间隔 
TimeUnit.SECONDS //此处决定上面数值的大小（天，小时，秒），此处表示秒
);


}
}


Lamp:
package PilotLamp;


public enum Lamp {

//车辆的在十子路口出现的转弯方向
S2N("N2S", "S2w", false), S2W("N2E", "E2W", false), E2W("W2E", "E2s", false), E2S("W2E", "S2N", false),
N2S(null, null, false), N2E(null, null, false), W2E(null, null, false), W2N(null, null, false),
S2E(null, null, false), E2N(null, null, false), N2W(null, null, false), W2S(null, null, false);

private Lamp(String opposite, String next, boolean lighted){
this.opposite = opposite;
this.next = next;
this.lighted = lighted;
}

private boolean lighted; //表示绿灯的变量
private String opposite;
private String next;
public boolean isLighted(){ //查看是否是绿灯
return lighted;

}

//某个方向的绿灯亮起的时候则它对应方向的绿灯的亮起
public void light(){
this.lighted = true;
if(opposite != null){
Lamp.valueOf(opposite).light(); //返回枚举对象格式： 枚举类。valueOf（对象）
}
System.out.println(name() + " is green");
}
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:
package PilotLamp;


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();

//定时器
ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
timer.scheduleAtFixedRate(
new Runnable(){
public void run(){

currentLamp = currentLamp.blackOut();

}
}, 
10,
10,
TimeUnit.SECONDS);
}
}


MainClass:
package PilotLamp;


public class MainClass {
public static void main(String[] args){
String[] directions = new String[]{
"S2N", "S2W", "E2W", "E2S", "N2E", "W2N", "S2E", "E2N","N2W","W2S"
};
for(int i = 0; i < directions.length; i++){
new Road(directions[i]);

}

new LampController();
}
}

---------------------- ASP.Net+Android+IOS开发、.Net培训、期待与您交流！ ----------------------