import java.util.Scanner; public class demo_1 {/* 判断闰年 */ public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNext()){ int year = in.nextInt(); if (year<0 || year>10000000){ System.out.println("error,enter again!"); } else{ if (isLeapYear(year)) System.out.println(year+"是闰年"); else System.out.println(year+"不是闰年"); } } } public static boolean isLeapYear(int x){ return (x%4==0 && x%100!=0 || x%400==0) ? true : false; } }