How to get all sub-directory and all files name in a given directory?

Given a specific directory, How to get all sub-directory and all files name in this  directory?
I am using java, thanks

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import java.util.ArrayList;

public class Main {
    private ArrayList searchFolders = new ArrayList();
    private ArrayList searchFiles = new ArrayList();

    public static void main(String[] args) {
        Main main = new Main();
        main.retrieveSearchFolders(new File("D:\\Temp")); //Specify ur directory

    private void retrieveSearchFolders(File dir) {
        // System.out.println("Searching for Directory : " + dir);
        File[] files = dir.listFiles();
        if (files != null && files.length > 0) {
            for (int i = 0; i < files.length; i++) {
                if (files[i].isDirectory()) {
                    System.out.println("Adding Folder : " + files[i]);
                } else {
                    System.out.println("Adding File : " + files[i]);

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Oh..No help from my link?
ericylrAuthor Commented:
Karanw, sorry. i do not know how to assign the points to different people
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