P5716 月份天数

import java.util.*;
public class Main{
    private static int day(boolean isLeapYear,int month)//定义一个输入月份的函数
    {
        switch(month)
        {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                return 31;
            case 4:
            case 6:
            case 9:
            case 11:
                return 30;
            case 2:
                if(isLeapYear)
                {
                    return 29;
                }
                else
                {
                    return 28;
                }
                default:
                    return -1;
        }
    }
    private static boolean LeapYear(int year)//定义一个判断是否是闰年的函数
    {
        if(year%400==0)
        {
            return true;
        }else if(year%100==0)
        {
            return false;
        }else if(year%4==0)
        {
            return true;
        }else
        {
            return false;
        }
    }
public static void main(String[] args) {
        // TODO 自动生成的方法存根
     Scanner in=new Scanner(System.in);
     int year=in.nextInt();
     int month=in.nextInt();
     System.out.println(day(LeapYear(year),month));
  }
}