Recursive and non-recursive methods to get all the files and folders in a folder

/******************************************************* Recursive implementation of *************************************************** /

/**
* Get all files for a folder
* @param filePath Get the folder path of the file
* @param myFiles file collection for saving files
* @return All files and folders
* @throws IOException
*/
public static arraylist<file> Getallfiles (String FilePath,
Arraylist<file> myFiles) throws IOException {//due to recursive invocation of the function itself, use formal parameters to do the return value of the function
File File = new file (FilePath);
if (file.exists ()) {//Determine if the folder exists
For (File fi:file.listFiles ()) {//Traverse folder
if (Fi.isdirectory ()) {
Myfiles.add (FI);//If a folder is added to the collection
Getallfiles (Fi.getcanonicalpath (), myFiles);//If the directory is a recursive call
} else {
Myfiles.add (FI);//If the file is added to the collection
}
}
}
Return myfiles;//returns all files and folders
}

/********************************************************* non-recursive implementation ************************************************ /

/**
* Get all Files under a directory (non-recursive implementation)
* @param path Directory
* @return All files and folders
*/
public static arraylist<file> Getallfilesanddirs (String path) {
File File = new file (path), Tempfile = null;//defines a temporary file variable and initializes it to null based on the path path to the new one
int index = 0;//defines the index of the collection and initializes it to 0
arraylist<file> dirlist = new arraylist<file> ();//define a collection of saved folders
arraylist<file> fileList = new arraylist<file> ();//define a collection of saved files
if (file.exists () && file.isdirectory ()) {//Determine if file is a folder
Dirlist.add (file);//Add File to the folder collection
Tempfile = dirlist.get (0);//Initialize temporary file variable
} else {
Filelist.add (file);//If file is files, add to file collection
}
while (tempfile! = null) {//While loop, exit loop If temp file variable is empty
index++;//Index self-increment
for (file Fi:tempFile.listFiles ()) {//Traversal tempfile temp file variable
if (Fi.isdirectory ()) {
Dirlist.add (FI);//Tempfile a folder exists in the temporary file variable to be added to the folder collection
} else {
Filelist.add (FI);//tempfile files in temporary file variables are added to the file collection
}
}
if (Index < dirlist.size ()) {//To avoid array out-of-bounds, only if the index is less than the collection length, Tempfile re-assigns the folder object to the folder collection
Tempfile = Dirlist.get (index);//Tempfile is re-assigned as the Index folder object of a folder collection
} else {
Tempfile = null;//When the index variable is greater than the folder collection length, the Tempfile assignment is empty, at which time the loop ends
}
}
for (File fi:dirlist) {//Traverse Folder collection
Filelist.add (FI);//Add the Folder object in the folder collection to the File collection
}
Return filelist;//the file collection FileList get all the folders and files back to the collection
}

Recursive and non-recursive methods to get all the files and folders in a folder