精简40行代码Java万年历

万年历

2020.09.20

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用Java写万年历。
输入年份，月份，输出如图所示效果。

一、效果图

二、代码如下

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

public class MonthlyCalendarDemo {
    static final String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int counter = 0 ;
        System.out.println("请输入年份：");
        int year = scan.nextInt();
        System.out.println("请输入月份：");
        int month = scan.nextInt()-1;

        GregorianCalendar gCale = new GregorianCalendar(year,month,1);
        int totalDay = gCale.getActualMaximum(Calendar.DAY_OF_MONTH);
        int startWeekDay = gCale.get(Calendar.DAY_OF_WEEK)-1;


        for (String weekDay : weekDays){
            System.out.printf(weekDay+"  ");//两个空格
        }
        System.out.println();
        for (counter = 0; counter<startWeekDay;counter++){
            System.out.printf("       ");//七个空格
        }
        for (int day = 1; day<totalDay;day++){
            System.out.printf("  %2d   ",day);//前二后三
            counter++;
            if (counter%7==0){
                System.out.println();//换行
            }
        }
    }
}