已经有了sc.close还是会有警告neverclosed？

Question

import java.util.Scanner;


public class Helloworld {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int i;
        int num1 = 1;
        int num2 = 1;
        System.out.print("请输入要查询的第几个数：");

        int n = sc.nextInt();
        for (i = 1; i < n - 1; i++) {
            int temp;
            temp = num1;
            num1 = num2 + temp;
            num2 = temp;
        }
        System.out.println(num1);
        sc.close();
    }
}
显示警告：
Resource leak: 'sc' is never closed    

才学java 不懂为啥非常菜

Answer 1

Resource leak: 'sc' is never closed
这个提醒每次都有吗，我运行你的代码，就没这种问题。