public static void main(String args[]){
    
    Scanner s=new Scanner(System.in);
    int year = 0;
    while(year<=0){
        System.out.print("请输入一个年份：");
        year=s.nextInt();
        continue;
    }
        
    IsLeapyear(year);
}

private static boolean IsLeapyear(int year) {
    if(year%4==0 && year%100!=0)
    {
        System.out.println(year+"年是闰年");
        return true;
    }
    else if (year%400==0) {
        System.out.println(year+"年是闰年");
        return true;
    }
    else {
        System.out.println(year+"年是平年");
        return false;
    }

}