java日历显示年份、月份

import java.util.Scanner;

class CalendarMain
{
   //主函数入口
   public static void main(String[] args)
   {
       System.out.println("*****请输入日期(格式如: 2011-01)*****");
       Scanner sc = new Scanner(System.in);
        String ym = sc.next();
       //截取字符串
       String[] yearMonth = ym.split("-");
       //将字符串转化成整型
       int year = Integer.parseInt(yearMonth [0]);
       int month = Integer.parseInt(yearMonth [1]);
       Year.fun(year);
       Month.fun(month,year);
   }
}

//获取闰年个数
class Year
{
   //多少个闰年
   static int leapYear = 0;

   public static void fun(int year){
       if(year > 1990 && year <10000){
           while(year >= 1990){
               if(year % 4 == 0 && year % 100 != 0 || (year % 400 ==0 )){
                   leapYear ++;
               }
               year --;
           }
       }else{
            System.out.println("请输入查询的年份大于或等于1990年!");
       }
   }
}

//获取一个月多少天和总天数
class Month
{
   public static void fun(int month,int year){
       int monthDay = 0;
       Year y = new Year();
       int days = y.leapYear + (year - 1990)*365;
       if(month > 0 && month <=12){
           for(int i = 1;i <= month;i++){
               if(i < 8 && i != 2){
                   days += i % 2 == 1 ? 31 :30;
                   monthDay = i % 2 == 1 ? 31 :30;
               }
               if(i > 7){
                   days += i % 2 == 1 ? 30 :31;
                   monthDay = i % 2 == 1 ? 30 :31;
               }
                if(i == 2){
                   if(year % 4 == 0 && year % 100 != 0 || (year % 400 ==0 )){
                       days += 28;
                       monthDay = 29;
                   }else{
                       days += 28;
                       monthDay = 28;
                   }
               }
           }
           Show.mothed(days,monthDay);
        }else{
             System.out.println("请输入正确的月份！");
       }
   }
}

//显示日历
class Show
{
   public static void mothed(int days, int monthDay){
          //加一表示从星期一开始
          int week = (days - monthDay) % 7 + 1;

          System.out.println("\n周日"+"\t周一"+"\t周二"+"\t周三"+"\t周四"+"\t周五"+"\t周六");
          for (int i = 1;i <= monthDay + week ;i++ )
          {
              if(i <= week){
                  System.out.print(" "+"*"+"\t");
              }else{
                  if((i-week) < 10){
                       System.out.print(" "+(i-week)+"\t");
                   }else{
                       System.out.print((i-week)+"\t");
                   }
              }
           if(i%7 == 0){
                  System.out.print("\n");
               }
          }
   }
}