Question

我有一个开始时间（在这种情况下是9点钟），并且有一定的小时数被添加到它，然后需要计算当前时间。我正在使用的当前方法是添加传递给原始时间的小时数，然后按模数加12，如下所示：timeAndHoursPassed % 12 = currentTime这在所有情况下都适用，除非添加的时间可被12整除，在这种情况下我得到当前时间为零而不是12.我该如何解决这个问题？另外，如果可能的话，我宁愿使用一些基本的数学，而不是使用GregorianCalender类。感谢您提前提供的任何帮助。我的代码如下：

package week11;

import java.util.Scanner;

public class PassingTrains {
    static int currentTime = 9, firstDistance = 0, secondDistance = 0, firstSpeed = 40, secondSpeed;
    static Scanner input = new Scanner(System.in);
    public static String passTime(){
        System.out.print("Enter the speed of the passenger train: ");
        secondSpeed = input.nextInt();
        while (currentTime < 11) {
            firstDistance += firstSpeed;
            currentTime++;
        }
        while (firstDistance > secondDistance) {
            firstDistance += firstSpeed;
            secondDistance += secondSpeed;
            currentTime++;
        }
        if (firstDistance == secondDistance){
            return ("at " + currentTime % 12);
        } else {
            return ("between " + (currentTime - 1) % 12 + " o'clock and " + currentTime % 12);
        }
    }

    public static void main(String[] args) {
            System.out.println("The passenger train passed the freight train at " + passTime() + " o'clock");
            System.out.println("The freight train was traveling " + firstSpeed + " mph");
            System.out.println("The passenger train was traveling at " + secondSpeed + " mph");
    }
}

Answer 1

分为两部分：

您必须将模24应用于已用时间。为什么。如果你从今天上午9点开始，经过24小时，你会增加零小时（24％24），第二天就有9点。
让我们假设已经过了37岁。在上面应用＃1，你有超过24小时13小时。添加13到9，你有22小时（晚上10点）。如果您不想使用24小时日历，则从当前小时IF当前小时减去12> 12。

示例代码：

currentTime += elapsedTime % 24; 
if(currentTime > 12) 
{
    currentTime -= 12;
}

更新：OP的更正代码

public class PassingTrains
{
    static int currentTime = 9, firstDistance = 0, secondDistance = 0,
            firstSpeed = 40, secondSpeed, elapsedTime;
    static Scanner input = new Scanner(System.in);

    public static String passTime()
    {
        System.out.print("Enter the speed of the passenger train: ");
        secondSpeed = input.nextInt();
        while (currentTime < 11)
        {
            firstDistance += firstSpeed;
            currentTime++;
        }
        while (firstDistance > secondDistance)
        {
            firstDistance += firstSpeed;
            secondDistance += secondSpeed;
            elapsedTime++;  // changed this

        }
        // added the next two lines
        currentTime += elapsedTime % 24;
        currentTime = (currentTime > 12) ? currentTime - 12 : currentTime;

        if (firstDistance == secondDistance)
        {
            return ("at " + currentTime); // fixed this
        }
        else
        {
            return ("between " + ((currentTime - 1 == 0) ? 12 : currentTime - 1) + " o'clock and " + currentTime); \\fixed this
        }
    }

    public static void main(String[] args)
    {
        System.out.println("The passenger train passed the freight train at "
                + passTime() + " o'clock");
        System.out.println("The freight train was traveling " + firstSpeed
                + " mph");
        System.out.println("The passenger train was traveling at "
                + secondSpeed + " mph");
    }
}

将小时数转换为当前时间

1 个答案: