java - Java 中耗时？

Question

我正在 Java 课上做作业。除了关于耗时的这一部分之外，我得到了大部分内容。我们必须使用方法。这是我的作业和代码。

"You have just been hired by a company to do it’s weekly payroll. One of the functions you must perform daily is to check the employee time cards and compute the elapsed time between the time they “punch in” and “punch out”. You also have to sometimes convert hours to minutes, days to hours, minutes to hours and hours to days. Since you’ve just finished your first programming class you decide to write a program that will help you do your job.

You decide to structure your program the following way. The main function will just be a menu that the user can select from to get the information they want. Each option on the menu will call a specific method(s) to solve the task and/or output the answer.

You may assume for this program that all elapsed times will be in a single day but the others may span much further. Be sure to provide sufficient test data to demonstrate that your solutions are correct. (show at least one output for each conversion [probably several for option #5]). "

import java.util.*;
public class Prog671A
{
    public static void hoursToMinutes()
    {
        Scanner input = new Scanner (System.in);
        System.out.print("Enter hour(s): ");
        int hours = input.nextInt();
        System.out.println(hours + " * 60 = " + (hours * 60) + " minutes.");
        System.out.println("");
    }
    
    public static void daysToHours()
    {
        Scanner input = new Scanner (System.in);
        System.out.print("Enter day(s): ");
        int days = input.nextInt();
        System.out.println(days + " * 24 = " + (days * 24) + " hours.");
        System.out.println("");
    }
    public static void minutesToHours()
    {
        Scanner input = new Scanner (System.in);
        System.out.print("Enter minute(s): ");
        int minutes = input.nextInt();
        System.out.println(minutes + " / 60 = " + ((double)minutes / 60) + " hours.");
        System.out.println("");
    }
    public static void hoursToDays()
    {
        Scanner input = new Scanner (System.in);
        System.out.print("Enter hour(s): ");
        int hours = input.nextInt();
        System.out.println(hours + " / 24 = " + ((double)hours / 24) + " days.");
        System.out.println("");
    }
    public static void elapsedTime()
    {
        Scanner input = new Scanner (System.in);
        System.out.print("Enter the beginning hour: ");
        int startingHour = input.nextInt();
        System.out.print("Enter the beginning minute(s): ");
        int startingMinutes = input.nextInt();
        System.out.print("Enter AM/PM: ");
        String startingAmOrPm = input.nextLine();
        System.out.print("Enter the ending hour: ");
        int endingHour = input.nextInt();
        System.out.print("Enter the ending minute(s): ");
        int endingMinutes = input.nextInt();
        System.out.print("Enter AM/PM: ");
        String endingAmOrPm = input.nextLine();
        System.out.println("");
        System.out.println("The elapsed time is: " + );
    }
    public static void main (String args [])
    {
        int x = 1;
        while (x == 1) {
        Scanner input = new Scanner (System.in);
        System.out.println("Conversion Tasks");
        System.out.println("\t1. Hours -> Minutes");
        System.out.println("\t2. Days -> Hours");
        System.out.println("\t3. Minutes -> Hours");
        System.out.println("\t4. Hours -> Days");
        System.out.println("\t5. Elapsed time between two times");
        System.out.println("\t6. Exit");
        System.out.print("Enter a number: ");
        int menu = input.nextInt();
        System.out.println("");
        if (menu == 1)
            hoursToMinutes();
        if (menu == 2)
            daysToHours();
        if (menu == 3)
            minutesToHours();
        if (menu == 4)
            hoursToDays();
        if (menu == 5)
            elapsedTime();
        if (menu == 6)
            x = 0;
        }
    }
}

我只是需要帮助

public static void elapsedTime()
{
    Scanner input = new Scanner (System.in);
    System.out.print("Enter the beginning hour: ");
    int startingHour = input.nextInt();
    System.out.print("Enter the beginning minute(s): ");
    int startingMinutes = input.nextInt();
    System.out.print("Enter AM/PM: ");
    String startingAmOrPm = input.nextLine();
    System.out.print("Enter the ending hour: ");
    int endingHour = input.nextInt();
    System.out.print("Enter the ending minute(s): ");
    int endingMinutes = input.nextInt();
    System.out.print("Enter AM/PM: ");
    String endingAmOrPm = input.nextLine();
    System.out.println("");
    System.out.println("The elapsed time is: " + );
}

Answer 1

只需将开始和结束时间转换为自一天开始(午夜)以来的分钟数。对于下午，只需在小时上加上 12，然后再转换为分钟。然后减去并转换回耗时的小时和分钟。