Java Job 5: determine a certain period of how many days

package Lx;
/**

• 31 days: 1,3,5,7,8,10,12
• Day 30: 2.4.6.9,11
• February: Formula for determining leap years ()% 40&&年%100!=0&||年%4000

•  平年:28天
  

•  闰年:29天
  

• */
  import java.time.Year;
  import java.util.Scanner;

{class IFTest public
public static void main (String [] args) {
Scanner Scanner new new Key = (the System.in);
System.out.println ( "Please enter the year:");
// year year
int year = key.nextInt ();
System.out.println ( "Please enter the month:");
// month The month
int month = key.nextInt ();

   /* if (month==1||month==3||month==5||month==7||month==8||month==10||month==12){
        System.out.println(year+"年"+month+"月"+"这个月是31天");
    }else if (month==4||month==6||month==9||month==11){
        System.out.println(year+"年"+month+"月"+"这个月是30天");
    }else if (month==2){
            if( year%4==0&&year%100!=0||year%400==0){
                System.out.println(year+"年"+month+"月"+"这个月是29天");
            }else {
                System.out.println(year+"年"+month+"月"+"这个月是28天");
            }
    }else {
        System.out.println("请输入正确的月份");
    }*/
    //优化方法days天数
    int days = 0;
    if (month==1||month==3||month==5||month==7||month==8||month==10||month==12){
        days = 31;
    }else if (month==4||month==6||month==9||month==11){
        days = 30;
    }else if (month==2){
            if( year%4==0&&year%100!=0||year%400==0){
                days = 29;
            }else {
                days = 28;
            }
    }else {
        System.out.println("请输入正确的月份");
    }
    System.out.println(year+"年"+month+"月"+"这个月有"+days+"天");
    key.close();
}

}