java日历软件设计

以下是一个简单的Java日历软件设计的示例：

import java.util.Scanner;

public class CalendarSoftware {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        // 输入年份和月份
        System.out.print("请输入年份：");
        int year = scanner.nextInt();
        System.out.print("请输入月份：");
        int month = scanner.nextInt();
        
        // 检查年份和月份的有效性
        if (year < 1900 || month < 1 || month > 12) {
            System.out.println("输入的年份或月份无效！");
            return;
        }
        
        // 调用日历生成方法
        generateCalendar(year, month);
    }
    
    public static void generateCalendar(int year, int month) {
        // 输出日历标题
        System.out.println("日\t一\t二\t三\t四\t五\t六");
        
        // 计算该月第一天是星期几
        int firstDayOfWeek = getFirstDayOfWeek(year, month);
        
        // 计算该月的天数
        int daysInMonth = getDaysInMonth(year, month);
        
        // 输出日历内容
        for (int i = 0; i < firstDayOfWeek; i++) {
            System.out.print("\t");
        }
        for (int i = 1; i <= daysInMonth; i++) {
            System.out.print(i + "\t");
            if ((firstDayOfWeek + i) % 7 == 0) {
                System.out.println();
            }
        }
    }
    
    public static int getFirstDayOfWeek(int year, int month) {
        // 根据公式计算星期几
        int q = 1;
        int m = month;
        int K = year % 100;
        int J = year / 100;
        int h = (q + 13 * (m + 1) / 5 + K + K / 4 + J / 4 + 5 * J) % 7;
        int dayOfWeek = (h + 5) % 7;
        
        // 转换为星期天为第一天的格式
        return (dayOfWeek + 6) % 7;
    }
    
    public static int getDaysInMonth(int year, int month) {
        // 判断是否为闰年
        boolean isLeapYear = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
        
        // 根据月份返回天数
        switch (month) {
            case 2:
                return isLeapYear ? 29 : 28;
            case 4:
            case 6:
            case 9:
            case 11:
                return 30;
            default:
                return 31;
        }
    }
}