Java 使用Calendar類輸出指定年份和月份的日歷

 

 

package com.cyl.test3;

import java.util.Calendar;
import java.util.Scanner;

public class RiLi {
    public static void main(String[] args){
        int year= 2020;
        int month = 2;

        Calendar calendar = Calendar.getInstance();
        //由於Java中月份從0月開始計數,所以真實月份12月(month=12) 需要減1 才是Java中的12月
        calendar.set(year,month-1,1);//每月首日星期幾
        int weekday = calendar.get(Calendar.DAY_OF_WEEK)-1;
        System.out.println("當月首日星期" + weekday);

        int maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
        System.out.println("當月最大天數" + maxDay);
        System.out.println("\t\t"+year+"年"+month+"月");
        System.out.println("一\t二\t三\t四\t五\t六\t日\t");
        int temp = 0;
        //補空格
        for(int i = 0; i < weekday-1;i++)
        {
            System.out.print("\t");
            temp++;
        }

        for(int i = 1; i <= maxDay;i++)
        {
            System.out.print(i+"\t");
            if((temp+i)%7==0)
            {
                System.out.println();
            }
        }

    }
}