How to Get a List of Filenames from a Directory in Java?

Obtaining Filenames from a Directory

To create a list of filenames within a folder, follow these steps:

1. Initialize the File Object:

<code class="java">File folder = new File("path/to/directory");</code>

2. Retrieve File List:

<code class="java">File[] listOfFiles = folder.listFiles();</code>

3. Iterate over File List and Check Type:

<code class="java">if (listOfFiles != null) {
 for (int i = 0; i < listOfFiles.length; i++) {
  if (listOfFiles[i].isFile()) {
    // Extract and store filename
  } else if (listOfFiles[i].isDirectory()) {
    // Process directory if necessary
  }
 }
}</code>

4. Filter Based on File Type (Optional):

<code class="java">// Filter for JPEG files if needed
if (file.getName().endsWith(".jpg")) {
  // Add filename to list
}</code>

This code snippet demonstrates how to retrieve all filenames from a directory. You can specify further criteria, such as file types, by modifying the if conditions in step 4 as necessary.

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