import java.util.Scanner;//导包 public class LeapYear {     public static void main(String[] args) {         //创建键盘录入对象         Scanner sc = new Scanner(System.in);                  //录入数据         System.out.println("请输入年份：");         int year = sc.nextInt();                  if(year < 0) {             System.out.println("你输入的年份有误");         }else if(isLeapYear(year)) {             System.out.println(year+"是闰年");         }else {             System.out.println(year+"是平年");         }              }          /*         需求：         两个明确：             返回值类型：boolean             参数列表：int year     */     public static boolean isLeapYear(int year) {         return (year%100 == 0 && year%400 == 0 || year%100 != 0 && year%4 == 0)? true : false;     } }