需要修复我的Java Timer代码

2019年8月4日 106次阅读

任务 – 在一天中的指定时间打开和关闭灯泡.我需要知道如何根据下面给出的信息修复我的代码.我还需要知道我是否正确使用了计时器类,也就是说,我的代码设计是否正确？代码可能有用,但可能是糟糕的设计,以后会引起问题.我不希望这种情况发生.

输出是(这不是我真正想要的输出:() –

This is the main program
Current time is - xxx
Future time is - xxx+5sec
Future time is - xxx+10sec
Main program ends
Bulb B1 is OFF

期望的输出 –

This is the main program
Current time is - xxx
Future time is - xxx+5sec
Future time is - xxx+10sec
Bulb B1 is ON  //first on
Bulb B1 is OFF //then off
Main program ends//This should always be in the end.

如何修复下面的代码以获得我想要的内容？

灯泡类

class Bulb {

private boolean state = false;//On or off
private String name;

Bulb(String name){

    this.name = name;

}

public void setState(boolean state){

    this.state = state;
    if(this.state == true){

        System.out.println("Bulb " + name + " is ON");

    }else{

        System.out.println("Bulb " + name + " is OFF");

    }

}


public boolean getState(){
    return this.state;

}


}

BulbJob类是一个TimerTask

import java.util.*;

class BulbJob extends TimerTask{

private Bulb bulbToHandle;
private boolean setBulbStateEqualTo;

BulbJob(Bulb toHandle){

    this.bulbToHandle = toHandle;

}


//NOTE: Must be called before run(), otherwise default value is used
public void setBulbStateEqualTo(boolean setBulbStateEqualTo){

    this.setBulbStateEqualTo = setBulbStateEqualTo;

}


//NOTE: call run() only before calling above method
public void run(){

    this.bulbToHandle.setState(setBulbStateEqualTo);//Set on or off

}

}

BulbScheduler类 – 这是在灯泡打开或关闭时安排的.

import java.util.*;

@SuppressWarnings( "deprecation" )
class BulbScheduler {

public static void main(String args[]) throws InterruptedException{

    System.out.println("This is the main program");

    Timer time = new Timer();
    Bulb b1 = new Bulb("B1");
    BulbJob bj = new BulbJob(b1);

    bj.setBulbStateEqualTo(true);//Task - Turn bulb on at time = afterCurrent

    Date current = new Date();//Get current time and execute job ten seconds after this time
    Date afterCurrent = (Date) current.clone();

    System.out.println("Current time is - " + current);

    int currentSecs = current.getSeconds();
    int offset = 5;//number of seconds

    afterCurrent.setSeconds(currentSecs + offset);
    System.out.println("Future time is - " + afterCurrent);

    time.schedule(bj, afterCurrent);//Schedule job "bj" at time = afterCurrent

    //Now turn the bulb off at new time = newest afterTime
    afterCurrent.setSeconds(currentSecs + 2 * offset);
    System.out.println("Future time is - " + afterCurrent);

    bj.setBulbStateEqualTo(false);//Task - Now turn the bulb off at time = afterCurrent

    System.out.println("Main program ends");

}

}

最佳答案 这个部分：

time.schedule(bj, afterCurrent);//Schedule job "bj" at time = afterCurrent

//Now turn the bulb off at new time = newest afterTime
afterCurrent.setSeconds(currentSecs + 2 * offset);

只安排一项任务.如果您需要安排两次,请明确这样做：

time.schedule(bj, afterCurrent);//Schedule job "bj" at time = afterCurrent

//Now turn the bulb off at new time = newest afterTime
afterCurrent.setSeconds(currentSecs + 2 * offset);
time.schedule(bj, afterCurrent);//Schedule job "bj" at time = afterCurrent

也.这一行：

bj.setBulbStateEqualTo(false);

在主线程中执行,因此它将在两个任务之前执行.您应该安排该语句在两个任务之间运行.

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