我用ChatGPT生成的：

import java.util.Scanner;

public class LunarCalendar {
    // 农历数据
    private static final int[] lunarInfo = {
        0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0,
        0x055d2, 0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2,
        0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60,
        0x09570, 0x052f2, 0x04970, 0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60,
        0x186e3, 0x092e0, 0x1c8d7, 0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4,
        0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0, 0x0b550, 0x15355, 0x04da0,
        0x0a5d0, 0x14573, 0x052d0, 0x0a9a8, 0x0e950, 0x06aa0, 0x0aea6, 0x0ab50, 0x04b60,
        0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5,
        0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0, 0x195a6, 0x095b0,
        0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570,
        0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5,
        0x092e0, 0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0,
        0x092d0, 0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0,
        0x15176, 0x052b0, 0x0a930, 0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6,
        0x0a4e0, 0x0d260, 0x0ea65, 0x0d530, 0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0,
        0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0, 0x055b2, 0x049b0,
        0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0
    };

    // 公历日期对应的农历月份和日期
    private static final String[] lunarMonthName = {
        "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "冬", "腊"
    };

    private static final String[] lunarDayName = {
        "初", "十", "廿", "卅"
    };

    private static final String[] lunarNumName = {
        "一", "二", "三", "四", "五", "六", "七", "八", "九", "十"
    };

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入公历年份：");
        int year = scanner.nextInt();
        System.out.print("请输入公历月份：");
        int month = scanner.nextInt();
        System.out.print("请输入公历日期：");
        int day = scanner.nextInt();

        String lunarDate = getLunarDate(year, month, day);
        System.out.println("农历日期：" + lunarDate);
    }

    // 获取农历日期
    public static String getLunarDate(int year, int month, int day) {
        int lunarYear = year;
        int lunarMonth, lunarDay;
        int offset = (int)((year - 1900) * 365.25);
        for (int i = 1900; i <= year; i++) {
            offset += isLeapYear(i) ? 366 : 365;
        }

        for (lunarMonth = 1; lunarMonth <= 13; lunarMonth++) {
            int days = getLunarMonthDays(lunarYear, lunarMonth);
            if (offset >= days) {
                offset -= days;
            } else {
                break;
            }
        }

        lunarDay = offset + 1;
        if (lunarMonth > 12) {
            lunarMonth -= 13;
            lunarYear++;
        }
        
        String lunarMonthName = getLunarMonthName(lunarMonth);
        String lunarDayName = getLunarDayName(lunarDay);
        String lunarNumName = getLunarNumName(lunarDay);
        
        return lunarMonthName + "月" + lunarDayName + lunarNumName;
    }

    // 判断是否闰年
    public static boolean isLeapYear(int year) {
        return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
    }

    // 获取农历某年某月的天数
    public static int getLunarMonthDays(int year, int month) {
        if ((lunarInfo[year - 1900] & (0x10000 >> month)) == 0) {
            return 29;
        } else {
            return 30;
        }
    }

    // 获取农历月份名称
    public static String getLunarMonthName(int month) {
        return lunarMonthName[month - 1];
    }

    // 获取农历天数名称
    public static String getLunarDayName(int day) {
        int n = day % 10 == 0 ? 9 : day % 10 - 1;
        return lunarDayName[day / 10] + lunarNumName[n];
    }

    // 获取农历天数数字名称
    public static String getLunarNumName(int day) {
        if (day <= 10) {
            return lunarNumName[day - 1];
        } else if (day == 20) {
            return "二十";
        } else if (day == 30) {
            return "三十";
        } else {
            int n = day % 10 == 0 ? 9 : day % 10 - 1;
            return lunarNumName[n];
        }
    }
}


你也可以自己去问问。
【 在 ZhangShao 的大作中提到: 】
: RT
: 暂时不考虑用什么编程语言，只是问问计算方法是什么？
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