感觉这样简单一点: public class Main{ public static void main(String[] args){ Scanner in = new Scanner (System.in); int []a={31,28,31,30,31,30,31,31,30,31,30,31}; while(in.hasNextInt()){ int year = in.nextInt(); int month= in.nextInt(); if(year%4==0&&year/100!=0||year/400==0){ if(month==2){ System.ou...