Get List of files in Directory & Sub

package findissues;

import java.io.File;

public class OpenFolder {

    public void listFilesForFolder(final File folder) {
        for (final File fileEntry : folder.listFiles()) {
            if (fileEntry.isDirectory()) {
                this.listFilesForFolder(fileEntry);
            } else {
                System.out.println(fileEntry.getName());
            }
        }
    }

    public static void main(String[] args) {
        final File folder = new File("C://Users/wanzu/Desktop");
        OpenFolder a = new OpenFolder();
        a.listFilesForFolder(folder);
    }
}