运行读取文件并对文件中的字符进行计数的程序导致 FileNotFoundException

Question

我正在尝试读取文件并计算文件中的字符数。下面是我的代码。但是，每当我运行代码时，NetBeans 总是输出以下错误消息：

run:
Exception in thread "main" java.io.FileNotFoundException: C:\TestData\data.txt (The system cannot find the file specified)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at java.io.FileInputStream.<init>(FileInputStream.java:93)
    at test.Count.main(Count.java:28)
C:\Users\Justin\AppData\Local\NetBeans\Cache.1\executor-snippets\run.xml:53: Java returned: 1

为什么会这样？有什么我想念的吗？

Count.java 文件的位置是 C:\Test\src\test\Count.java

import java.io.*;

public class Count {

    public static void countChars(InputStream in) throws IOException {
        int count = 0;

        while (in.read() != -1) {
            count++;
        }

        System.out.println("Counted " + count + " chars.");
    }

    public static void main(String[] args) throws Exception {

        countChars(new FileInputStream("C:\TestData\data.txt"));

    }
}

data.txt 的位置是 C:\TestData\

Answer 1

我测试了你的代码，它运行良好。

尝试使用具有访问权限的目录，例如您的主文件夹。

C:\TestData\data

您确定您是无意中创建了 data.txt 文件而不是数据（没有扩展名）吗？

Answer 2

默认隐藏所有已知文件扩展名 windows

我认为这里的问题是您无法查看文件扩展名。在Folder Options>View

中取消勾选Hide extensions for known file types即可查看

运行读取文件并对文件中的字符进行计数的程序导致 FileNotFoundException

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运行 读取文件并对文件中的字符进行计数的程序导致 FileNotFoundException

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运行读取文件并对文件中的字符进行计数的程序导致 FileNotFoundException