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。