輸出某年某月有幾天

import java.util.Scanner;

public class Test01 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

int year = sc.nextInt();

int month = sc.nextInt();

int days = 0;

switch (month) {

case 2:

if((year%4==0&&year%100!=0)||year%400==0){

days = 29;

}else{

days = 28;

}

break;

case 4:

case 6:

case 9:

case 11:

days = 30;

break;

default:

days = 31;

break;

}

System.out.println(days);

}

}