用Java和C#写一个日历

• Java代码

package com.company;

import java.time.DayOfWeek;
import java.time.LocalDate;

public class Main {
    public static void main(String[] args) {

        LocalDate date = LocalDate.now();
        int month = date.getMonthValue();//获得当前的月
        int today = date.getDayOfMonth();//获得当前的日

        date = date.minusDays(today - 1);//设置日期为当月的第一天
        DayOfWeek weekday = date.getDayOfWeek();//获得日期是星期几
        int value = weekday.getValue();//获得星期几的数值

        System.out.println("Mon Tue Wed Thu Fri Sat Sun");
        for (int i = 1; i < value; i++) {
            System.out.print("    ");
        }

        while (date.getMonthValue() == month) {
            System.out.printf("%3d", date.getDayOfMonth());
            if (date.getDayOfMonth() == today)
                System.out.print("*");
            else
                System.out.print(" ");

            date = date.plusDays(1);

            if (date.getDayOfWeek().getValue() == 1)
                System.out.println();
        }
    }
}

• C#代码

using System;

namespace CalendarTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var date = DateTime.Now;
            int month = date.Month;
            int today = date.Day;

            date = date.AddDays(-today + 1);
            var weekday = date.DayOfWeek;
            int value = (int)weekday;

            Console.WriteLine(" Mon Tue Wed Thu Fri Sat Sun");
            for (int i = 1; i < value; i++)
                Console.Write("{0,4}","");

            while (date.Month==month)
            {
                Console.Write("{0,4}", date.Day);
                if(date.Day==today)
                    Console.Write("*");
                else
                    Console.Write("");
                date = date.AddDays(1);
                if((int)date.DayOfWeek==1)
                    Console.WriteLine();
            }
        }
    }
}