How to Copy Files to a Subdirectory in Java?

Copying Files to Subdirectories in Java

Question:

How can I copy files from a directory into a subdirectory within the same directory using Java? I wish to iterate through the first 20 files in a directory, copying them to a newly created subdirectory named "trainingData."

Answer:

While Java does not natively provide a function for this specific task, a third-party library can efficiently resolve it. The Apache Commons IO library offers the FileUtils class with a method called copyDirectory.

Code Example:

import org.apache.commons.io.FileUtils;

File sourceDirectory = new File("path/to/sourceDirectory");
File destinationDirectory = new File("path/to/sourceDirectory/trainingData");

try {
    FileUtils.copyDirectory(sourceDirectory, destinationDirectory);
} catch (IOException e) {
    e.printStackTrace();
}

This code will copy all files and subdirectories within the sourceDirectory to the destinationDirectory. The trainingData directory must be created beforehand.

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