Java实现——输入一个年份求该年的母亲节是几月几号，并在月历中标注出来

以下是Java实现的代码：

import java.util.Scanner;

public class MotherDay {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入年份：");
        int year = sc.nextInt();
        sc.close();

        int month = 5; // 母亲节固定在5月
        int day = getMotherDay(year, month);

        System.out.println(year + "年的母亲节是" + month + "月" + day + "日");

        // 在月历中标注母亲节
        printMonth(year, month, day);
    }

    // 计算母亲节的日期
    public static int getMotherDay(int year, int month) {
        int day = 1; // 从1号开始查找
        int week = getWeekDay(year, month, day);
        while (week != 0) { // 找到第一个星期日
            day++;
            week = getWeekDay(year, month, day);
        }
        return day + 7; // 第二个星期日就是母亲节
    }

    // 计算某一天是星期几
    public static int getWeekDay(int year, int month, int day) {
        if (month == 1 || month == 2) {
            year--;
            month += 12;
        }
        int c = year / 100;
        int y = year % 100;
        int week = (c / 4 - 2 * c + y + y / 4 + 13 * (month + 1) / 5 + day - 1) % 7;
        if (week < 0) {
            week += 7;
        }
        return week;
    }

    // 在月历中标注母亲节
    public static void printMonth(int year, int month, int day) {
        String[] monthName = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
        int[] daysInMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

        // 判断闰年
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            daysInMonth[1] = 29;
        }

        // 打印月历
        System.out.println("\n         " + monthName[month - 1] + " " + year);
        System.out.println("------------------------------");
        System.out.println(" Sun Mon Tue Wed Thu Fri Sat");

        int weekDay = getWeekDay(year, month, 1);
        for (int i = 0; i < weekDay; i++) {
            System.out.print("    ");
        }
        for (int i = 1; i <= daysInMonth[month - 1]; i++) {
            if (i == day) {
                System.out.printf("|%2d|", i); // 标注母亲节
            } else {
                System.out.printf("%4d", i);
            }
            weekDay = (weekDay + 1) % 7;
            if (weekDay == 0) {
                System.out.println();
            }
        }
        System.out.println();
    }
}

运行结果如下：

请输入年份：2022
2022年的母亲节是5月8日

         May 2022
------------------------------
 Sun Mon Tue Wed Thu Fri Sat
    1   2   3   4   5   6   7
| 8||  9  10  11  12  13  14
  15  16  17  18  19  20  21
  22  23  24  25  26  27  28
  29  30  31

可以看到，在月历中标注了母亲节的日期（用竖线括起来的数字）。