How do you efficiently copy files from one directory to another in Java?

Copying Files from One Directory to Another in Java: A Resolved Solution

In Java, copying files across directories can be a straightforward task. To address the specific issue raised, we can leverage the FileUtils class from the Apache Commons IO library.

The provided code snippet seeks to copy the first 20 text files from a directory named dir to a subdirectory named trainingData within dir. To accomplish this, we can employ the FileUtils.copyDirectory() method:

import org.apache.commons.io.FileUtils;

...

FileUtils.copyDirectory(source, dest);

Here, source represents the dir directory, and dest represents the trainingData subdirectory. This method will effectively copy all files and subdirectories from source to dest.

To implement this solution, remember to include the Apache Commons IO library as a dependency in your project. You can use a dependency manager like Maven or Gradle to add the following dependency:

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.11.0</version>
</dependency>

Once the library is added, you can incorporate the provided code snippet into your program. This will allow you to successfully copy files from one directory to another within the Java programming environment.

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