java算法小问题

import java.util.Scanner;
public class Day {
 public static void main(String[] args) {
  int[] days = {31,0,31,30,31,30,31,31,30,31,30,31};
  Scanner in = new Scanner(System.in);
  
  System.out.println("输入年份:");
  int year = in.nextInt();
  
  System.out.println("输入月份:");
  int mouth = in.nextInt();
  
  System.out.println("多少号:");
  int day = in.nextInt();

  if (year % 100 != 0) {
   if (year % 4 == 0) {
    days[1] = 29;  
   } else {
    days[1] = 30;
   }
  } else {
   if (year % 400 == 0) {
    days[1] = 29;
   } else {
    days[1] = 30;
   }
  }
  int all = 0;
  mouth -= 2;
  for (int i = 0; i <= mouth; i++) {
   all += days[i];
  }
  System.out.println(all+day);
 }
}

纯手打~~~