“阅读器”永远不会关闭。。。如何解决这个问题？[副本]

Question

import java.util.Scanner;

public class even {

    public static void main(String[] args) {

        Scanner reader = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = reader.nextInt();
        if(num % 2 == 0)
            System.out.println(num + " is even");
        else
            System.out.println(num + " is odd");
    }

}

它显示了“读卡器从未关闭”的错误。。。

Answer 1

你只需要做reader。close（） 退出函数之前或处理完对象之后：

import java.util.Scanner;

public class even {

    public static void main(String[] args) {

        Scanner reader = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = reader.nextInt();
        if(num % 2 == 0)
            System.out.println(num + " is even");
        else
            System.out.println(num + " is odd");

        reader.close();
    }

}