public class Hello {     public static void main(String[] args) {         Scanner scanner = new Scanner(System.in);         System.out.println("输入数字:");         int Sunxch = scanner.nextInt();         if (Sunxch%4==0 && Sunxch%100!=0 || Sunxch%400==0){             System.out.println("是润年");             return;         }         System.out.println("不是润年");     }}