摘要： import java.util.Scanner;public class RunNian { private void checkYear(String s){ String regex="^\\d{4}$"; if(s.matches(regex)){ int year=Integer.parseInt(s); if(year%4==0){ if(year%400==0){ System.out.println("Yes"); return; } if(year%100==0){ System.out.println("No"); 阅读全文