面向对象编程——红绿灯车辆能否通过问题

Posted 2021-09-17 一只醉虾

红灯亮时，禁止车辆通行，准许右转弯。
黄灯亮时，禁止车辆通行，如已过停车线需继续前进。
绿灯亮时，准许车辆通行。
小车可能会经过普通红绿灯路口，也可能经过导向红绿灯路口
请使用面向对象方法编写车辆能不能通行的逻辑实现

这题就是红绿灯设计题的简化版，笔试时间紧没有设计vehicle对象，将就着看

Lamp类

public enum Lamp {
    //R红 Y黄 G绿
    red("red","green",0),green("green","yellow",0),yellow("yellow","red",0),
    right("right",null,1);//添加一个判断右转的灯
    private String name=null;
    private String nextName=null;
    private int light;
    private Lamp(String name,String nextName,int light){
        this.name=name;
        this.nextName=nextName;
        this.light=light;
    }
    //获取当前交通灯的状态
    public int isLight(){
        return light;
    }
    //变更右转灯
    public void trunRightLight(){
        this.light=Math.random()>0.5?0:1;
        System.out.println("right changes to "+this.light);
    }

    //亮灯
    public void trunLighted(){
        this.light=1;//点灯
        System.out.println(this.name+" is lighted");
    }

    public Lamp blackOut(){
        this.light=0;//灭灯
        Lamp nextLamp=null;
        nextLamp=Lamp.valueOf(Lamp.this.nextName);
        nextLamp.trunLighted();//点亮下一个灯
        System.out.println(this.name+" truns "+nextLamp.name);
        return nextLamp;
    }
}

Road类

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

public class Road {
    private String roadName;
    public Road(String roadName){

        this.roadName=roadName;
        ScheduledExecutorService timer= Executors.newScheduledThreadPool(1);
        timer.scheduleAtFixedRate(
                new Runnable() {
                    @Override
                    public void run() {
                        int right=Lamp.valueOf("right").isLight();//是否导向路口
                        int green=Lamp.valueOf("green").isLight();//绿灯亮了没
                        int yellow=Lamp.valueOf("yellow").isLight();//
                        int red=Lamp.valueOf("red").isLight();//
                        int line=Math.random()>0.5?0:1;//随机模拟，0就没过线，1就过线了
                        //红灯
                        if(red==1){
                            if(right==1){
                                System.out.println("the vehichle only can trun right.");
                            }else {
                                System.out.println("the vehichle can\'t pass.");
                            }
                        }
                        //绿灯
                        if(green==1){
                            if(right==1){
                                System.out.println("the vehichle can go straight or turn right.");
                            }else {
                                System.out.println("the vehichle can only go straight.");
                            }

                        }
                        //黄灯过线可以直行，不过线不给走
                        if(yellow==1){
                            if(line==1){
                                System.out.println("the vehichle can go straight");
                            }else {
                                System.out.println("the vehichle only can trun right.");
                            }
                        }
                    }
                },
                 1,1, TimeUnit.SECONDS);
    }
}

LampController类

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

public class LampController {
    private Lamp lamp;
    private Lamp lamp2;
    private LampController(){
        lamp=Lamp.yellow;//指定初始为绿灯
        lamp.trunLighted();//点亮绿灯

        lamp2=Lamp.right;
        lamp2.trunRightLight();//随机点亮

        ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
        timer.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                lamp=lamp.blackOut();
                lamp2.trunRightLight();//随机点亮
            }
        },5,5, TimeUnit.SECONDS);
    }

    public static final LampController lampController=new LampController();
}

Test类

public class test {
    public static void main(String[] args) {
        LampController lampController=LampController.lampController;
        new Road("Stright");
    }
}