资源泄漏错误 [英] Resource Leak Error

问题描述

晚上全部。我是使用Java编程的完全初学者，我正在学习扫描程序，但是当我在Eclipse中输入这个基本代码时，我收到一条消息资源泄漏：'扫描程序'永远不会关闭。

Evening all. I am a complete beginner to programming with Java, and I am learning about "Scanner", but when I type this basic code into Eclipse, I get a message saying "Resource leak:'scanner' is never closed.

我做错了什么？

package inputting;

import java.util.Scanner;

public class Input {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        System.out.println(scanner.nextLine());
    }
}

推荐答案

使用扫描仪后，必须以关闭方法：

scanner.close();

你必须关闭它的原因是因为 Scanner 类实现了可关闭界面。直接来自t他是API：

The reason why you must close it is because the Scanner class implements the Closeable interface. Straight from the API:

A Closeable是可以关闭的数据的来源或目的地。调用
close方法来释放对象为
持有的资源（例如打开文件）。

A Closeable is a source or destination of data that can be closed. The close method is invoked to release resources that the object is holding (such as open files).

基本上，如果您从未关闭 Scanner ，那么程序将继续寻求输入并保持资源。这是一个真正的简单示例：

Essentially, if you never close the Scanner, then the program will continue to seek for input and keep hold of resources. Here is a really simple example:

    Scanner scanner = null;

    try {
        scanner = new Scanner(System.in);

        while (scanner.hasNext()) {
            System.out.println(scanner.next());
            //do whatever you need here
        }
    } finally {
        if (scanner != null) {
            scanner.close();
        }
    }

了解更多关于扫描仪<来自 API 的/ code> 。

Read more about Scanner from the API.

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