How to List All Filenames in a Java Directory?

Listing All Filenames in a Directory

Question:

In Java, how do you obtain a list containing the complete filenames of all files within a particular directory?

Sample Data:

Consider a directory with the following files:

• 000.jpg
• 012.jpg
• 013.jpg

Desired Output:

An ArrayList with the values [000, 012, 013] representing the file names.

Solution:

To retrieve the filenames of all files in a directory, utilize the following steps:

1. Instantiate a File object with the desired directory path.
2. Utilize the listFiles() method on this File object to obtain an array of File objects representing the files in the directory.
3. Iterate over the array and extract the filenames using the getName() method.

Example Code:

<code class="java">File folder = new File("your/path");
File[] listOfFiles = folder.listFiles();
if (listOfFiles != null) {
    for (File file : listOfFiles) {
        if (file.isFile()) {
            System.out.println("File: " + file.getName());
        }
    }
}</code>

Note:

• This code retrieves all file types by default. If you wish to filter for specific file types (e.g., JPEG), you can modify the listFiles() method to use file filters.
• The code assumes the folder path is valid and accessible on your system.

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