How to retrieve all file names in a folder using Java?

To retrieve all file names within a folder, Java’s File class can be used to achieve this. Below is a simple example code:

import java.io.File;

public class Main {
    public static void main(String[] args) {
        File folder = new File("/path/to/folder");
        File[] listOfFiles = folder.listFiles();

        if (listOfFiles != null) {
            for (File file : listOfFiles) {
                if (file.isFile()) {
                    System.out.println(file.getName());
                }
            }
        }
    }
}

In the code above, a File object is first created to represent the path of a specified folder. Then the listFiles() method is used to obtain an array of File objects for all the files and subfolders within the folder. Next, we iterate through this array and output the file names if the File object represents a file.

It is important to note that the listFiles() method in the File class only retrieves an array of File objects for immediate subfolders and files. If you need to traverse all files under each subfolder, you can use recursion to achieve this.