java万年历实现代码怎么写

以下是一个简单的Java万年历实现代码：

import java.util.Scanner;public class CalendarProgram {    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();        printCalendar(year, month);        scanner.close();    }    public static void printCalendar(int year, int month) {        int daysInMonth = getDaysInMonth(year, month);        int startDayOfWeek = getStartDayOfWeek(year, month);        System.out.println("日\t一\t二\t三\t四\t五\t六");        for (int i = 0; i < startDayOfWeek; i++) {            System.out.print("\t");        }        for (int day = 1; day <= daysInMonth; day++) {            System.out.print(day + "\t");            if ((day + startDayOfWeek) % 7 == 0) {                System.out.println();            }        }    }    public static int getDaysInMonth(int year, int month) {        int[] daysInMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};        if (month == 2 && isLeapYear(year)) {            return 29;        }        return daysInMonth[month - 1];    }    public static int getStartDayOfWeek(int year, int month) {        int totalDays = 0;        for (int y = 1900; y < year; y++) {            totalDays += isLeapYear(y) ? 366 : 365;        }        for (int m = 1; m < month; m++) {            totalDays += getDaysInMonth(year, m);        }        return (totalDays + 1) % 7;    }    public static boolean isLeapYear(int year) {        return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);    }}

这个代码实现了一个简单的万年历程序。用户可以输入年份和月份，然后程序会打印出对应的日历。程序使用了getDaysInMonth()函数来计算每个月的天数，getStartDayOfWeek()函数来计算每个月的第一天是星期几，isLeapYear()函数来判断是否是闰年。最后，printCalendar()函数根据上述计算结果打印出日历。