判断是否是闰年

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public class Test {     public static void main(String[] args) {         Scanner input=new Scanner(System.in);         System.out.println("请输入你想知道的年份？");         String s=input.nextLine();         int res=Integer.parseInt(s);         Boolean r= isLeapYear(res);         System.out.println(r);       }     public static boolean isLeapYear(int a){         if((a%4==0 && a%100!=0) || a%400==0) {             return true;         }else{             return false;         }     } }