Question

例如：输入是＆＃39; 03/10 / 2016＆＃39;在＆＃39; MM / dd / yyyy＆＃39;。总天数为69.确保计算闰年，以确定2月有28天还是29天。在Java中

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    int Month;
    int Year;
    int Day;
    int cal = 0, num, Tot = 365;
    System.out.print("Please enter the Month");
    Month = input.nextInt();
    System.out.print("Please enter the Year");
    Year = input.nextInt();
    System.out.print("Please enter the Day");
    Day = input.nextInt();
    if (Month == 2) {
        if (Year % 4 == 0)
            num = 29;
        else
            num = 28;
    } else if (Month == 1 || Month == 3 || Month == 5 || Month == 7
            || Month == 8 || Month == 10 || Month == 12)
        num = 31;
    else
        num = 30;
    if (Tot != 365) {
        System.out.println("Not valid");
    } else {
        cal = Tot - Day;
        System.out.println("Remaining month of Days=" + cal);
    }

}

Answer 1

试试这个：

public static void main(String[] strings) {

        Scanner input = new Scanner(System.in);

        System.out.print("Enter a month number: ");
        int month = input.nextInt();

        System.out.print("Enter a year: ");
        int year = input.nextInt();

        input.close();

        LocalDate date = LocalDate.of(year, Month.of(month), 01);
        int length = date.getMonth().length(false);

        System.out.print(Month.of(month).getDisplayName(TextStyle.FULL,
                Locale.US)
                + " " + year + " has " + length + " days");
    }

Answer 2

您的代码有几个缺陷：

该问题询问自今年年初以来的天数。最后，您计算并打印剩余的天数，直到年底。这不一样。
要计算一年中的剩余天数，您只需从一年中的总天数中减去输入的日期。这个月你什么都不做。你应该积累已经过去的所有月份的日子。
如果有闰年，则一年中的总天数为366而不是365.
闰年的检查并不完全是：2000年不是闰年。

我已更改您的代码以反映这些要点（我会让您参加练习以检查输入的日期和月份是否有效）：

import java.util.Scanner;

public class DayOfYear {

    private static int[] MONTH_LENGTHS = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int month;
        int year;
        int day;
        int remainingDays = 0, numDays = 0, totalDays = 365;
        System.out.println("Please enter the Month: ");
        month = input.nextInt();
        System.out.println("Please enter the Year: ");
        year = input.nextInt();
        System.out.println("Please enter the Day: ");
        day = input.nextInt();

        if (isLeapYear(year)) {
            totalDays++;
        }
        for (int iMonth = 1; iMonth < month; iMonth++) {
            numDays += MONTH_LENGTHS[iMonth];
            if (iMonth == 2 && isLeapYear(year)) {
                numDays++;
            }
        }
        numDays += day;

        remainingDays = totalDays - numDays;
        System.out.println("Number of days since start of the year = " + numDays);
        System.out.println("Remaining days of the year = " + remainingDays);

    }

    private static boolean isLeapYear(int year) {
        return year % 4 == 0 && year != 2000;
    }
}

如何计算自年初以来的天数

2 个答案: