Question

The question is rather simple, but my brain boils :(((
I know, that i should recursive function, but I can’t organize it properely,
because I’m limited by the types(it’s a requirment)

public String[] getFiles(String initialDir) {}

First in my code I get the list of files and directories of initialDir
then i go through the elements and look up for directories with the help of

.isDirectory()

and then I try to organize recursion, something like:

String [] buf = getFiles(Filelist[i].toString());

and here come troubles.

The main problem is, determining the size of obtained data and allocating
the necessary array of String [] type and further writing all recursion results
and first-call results to the resulting array of String [] type.

It really annoys me, so i need a fresh look from a side (maybe someone will help with
code in the function).

Thanks to all!

Answer 1

You can use a list in the body of your method then convert it to an array:

public String[] getFiles(String initialDir) {
   List<String> files = new ArrayList<String>();
   ...
       files.add(aLovelyFile);
   ...
       String[] moarFiles = getFiles(aLovelyDirectory);
       files.addAll(Arrays.asList(moarFiles));
   ...
   return files.toArray(new String[0]);
}