湖南大学Java编程题5. 计算日期

import java.util.Scanner;
public class Main
{
  public static void main(String[] args)
  {
    Scanner s=new Scanner(System.in);
    while(s.hasNext()){
      int year=s.nextInt(),day=s.nextInt();
      int[] monthdays={0,31,28,31,30,31,30,31,31,30,31,30,31};
        if ((year%4==0 && year%100!=0)||(year%400==0)){
            monthdays[2]=29;
        }
        int month=1;
        while (day>monthdays[month]){
            day -=monthdays[month++];
            if (month==13){
              month=1;
                year++;
            }
        }
        System.out.printf("%04d-%02d-%02d\n", year, month, day);
    }
    s.close();
  }
}