import java.util.Scanner;
public class hello {
public static void main(String[] args) {
Scanner in=new Scanner(System.in);
System.out.println("请输入年份:");
int year =in.nextInt();
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");
}
}
}
运算符错了,是&&和||
符号错误啊