[Java] Get the file path in the folder with List

import java.io.File;
import java.util.LinkedList;
import java.util.List;

public class FileUtils {

	/**
	 *Returns the Path of the folder or file in the argument directory as a string List
	 *
	 * @param root
	 * @return
	 */
	public static List<String> getFileList(String root) {
		return getFileList(new File(root));
	}

	/**
	 *
	 *Returns the Path of the folder or file in the argument directory as a string List
	 *
	 * @param root
	 * @return
	 */
	public static List<String> getFileList(File root) {
		return getFileList(root, null);
	}

	/**
	 *
	 *Returns the Path of the folder or file in the argument directory as a string List
	 *
	 * @param root
	 * @param fileList
	 * @return
	 */
	private static List<String> getFileList(File root, List<String> fileList) {
		//Returns null if the argument folder does not exist
		if (root == null || !root.exists())
			return null;
		if (fileList == null)
			fileList = new LinkedList<>();
		if (root.isDirectory())
			for (File f : root.listFiles())
				fileList.addAll(getFileList(f, null));
		else
			fileList.add(root.getPath());
		return fileList;
	}
}

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