输入年月日判断每年天数和周几

最新推荐文章于 2022-10-17 09:14:40 发布

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最新推荐文章于 2022-10-17 09:14:40 发布

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文章标签： java 算法数据结构

本文链接：https://blog.youkuaiyun.com/qq_62229338/article/details/126788705

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这篇博客介绍如何使用Java编程，根据输入的年月日确定该日期在当年是第几天以及对应的星期。通过算法和数据结构实现日期处理功能。

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输入年月日判断为今年的第几天和周几？

判断今年第几天的方法：

package com.stx.xy.testdate;

public class Date {
    public int day(int year,int month,int day){
        int fed = 28;
        int sum = 0;
        if ((year%4==0&&year%100!=0)||year%400==0){
            fed = 29;
        }
        switch (month){
            case 1:
                sum = day;
                break;
            case 2:
                sum = 31+day;
                break;
            case 3:
                sum = 31+fed+day;
                break;
            case 4:
                sum = 31+fed+31+day;
                break;
            case 5:
                sum = 31+fed+31+30+day;
                break;
            case 6:
                sum = 31+fed+31+30+31+day;
                break;
            case 7:
                sum = 31+fed+31+30+31+30+day;
                break;
            case 8:
                sum = 31+fed+31+30+31+30+31+day;
                break;
            case 9:
                sum = 31+fed+31+30+31+30+31+31+day;
                break;
            case 10:
                sum = 31+fed+31+30+31+30+31+31+30+day;
                break;
            case 11:
                sum = 31+fed+31+30+31+30+31+31+30+31+day;
                break;
            case 12:
                sum = 31+fed+31+30+31+30+31+31+30+31+30+day;
                break;
        }
        System.out.println(year+"年"+month+"月"+day+"日是"+year+"年的第"+sum+"天");
        return sum;
    }
}

判断为周几的方法：

package com.stx.xy.testdate;

public class Week {
    //公元1年1月1日星期天
    public void week(int year,int month,int day,int sum){
        for (int i =1;i <year;i++){
            if((i%4 == 0&&i%100!=0)||i%400==0){
                sum +=366;
            }else {
                sum += 365;
            }
        }
        if (sum % 7 ==0){
            System.out.println("今天是周日");
        }else {
            System.out.println("今天是周"+sum%7);
        }
    }


}

主类：

package com.stx.xy.testdate;

import java.util.Scanner;

public class TestDate {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        Date date = new Date();
        Week week = new Week();
        System.out.println("请输入年：");
        int y = sc.nextInt();
        while (true){
            System.out.println("请输入月：");
            int m = sc.nextInt();
            System.out.println("请输入日：");
            int d = sc.nextInt();
            if (m<=12&&d<=31){
                int sum =date.day(y,m,d);
                week.week(y,m,d,sum);
                break;
            }else {
                System.out.println("月/日输入错误，请重新输入。");
            }
        }
    }
}