Java实现万年历

好的，以下是Java实现万年历的代码：

import java.util.Scanner;

public class Calendar {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入年份：");
        int year = scanner.nextInt();
        System.out.print("请输入月份：");
        int month = scanner.nextInt();
        System.out.println("日\t一\t二\t三\t四\t五\t六");

        //确定当前月的第一天是星期几
        int firstDayOfWeek = getFirstDayOfWeek(year, month);
        //确定当前月的天数
        int totalDays = getTotalDaysOfMonth(year, month);

        //打印日历
        int day = 1;
        for (int i = 0; i < 6; i++) {
            for (int j = 0; j < 7; j++) {
                if (i == 0 && j < firstDayOfWeek) {
                    System.out.print("\t");
                } else if (day > totalDays) {
                    break;
                } else {
                    System.out.print(day + "\t");
                    day++;
                }
            }
            System.out.println();
        }
    }

    //获取当前月的第一天是星期几
    public static int getFirstDayOfWeek(int year, int month) {
        int y = year;
        int m = month;
        if (m == 1 || m == 2) {
            m += 12;
            y--;
        }
        int d = 1;
        int c = y / 100;
        y = y % 100;
        int w = (y + y / 4 + c / 4 - 2 * c + 26 * (m + 1) / 10 + d - 1) % 7;
        if (w < 0) {
            w += 7;
        }
        return w;
    }

    //获取当前月的天数
    public static int getTotalDaysOfMonth(int year, int month) {
        if (month == 2) {
            if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
                return 29;
            } else {
                return 28;
            }
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
            return 30;
        } else {
            return 31;
        }
    }
}

运行后，会提示输入年份和月份，然后输出该月份的日历。