package day02;
import java.util.Scanner;
public class Demo2 {
    public static void main(String[] args) {
        System.out.println("请输入一个年份（例如：2013）：");
        Scanner scanner = new Scanner(System.in);
        int year = scanner.nextInt();
        if (year<0||year>2099){
            System.out.println("请输入正确的年份：");
            System.exit(0);
        }
        if( ((year/4 == 0)&&( year/100 != 0))||(year/400 == 0));
        {System.out.println(year+"是闰年");}
        else
            System.out.println(year+"不是闰年");
    }
}

噢，谢谢。