Calende日历的制作

package day01.日期类.Acm;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Scanner;


public class test01 {
    public static void main(String[] args) throws ParseException {
        System.out.println("请输入日期:(格式:2021-10-8)");
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Date s1 = format.parse(s);
        Calendar c = new GregorianCalendar();
        c.setTime(s1);   //时间对象转为日期类

        int currentDay = c.get(Calendar.DATE);    //当前日期中的当前天 3
        c.set(Calendar.DAY_OF_MONTH, 1);   //首先设置日期c为每月1号
        //获取1号是星期几
        int firstDay = c.get(Calendar.DAY_OF_WEEK) - 1;
        System.out.println("第一天:" + firstDay);
        //获取总天数
        int totalMonth = c.getActualMaximum(Calendar.DAY_OF_MONTH);
        System.out.println("一t二t三t四t五t六t日");
        System.out.println("==========================");
        for (int j = 1; j < firstDay; j++) {   //当月第一天换行输出
            System.out.print("t");
        }

        for (int i = 1; i <= totalMonth; i++) {
            if (i == currentDay) {
                System.out.print("*");
            }
            System.out.print(i + "t");
            if ((i - (8 - firstDay)) % 7 == 0) {
                System.out.println();
            }
        }


    }
}