Question on File naming

Question

When my users create a new file I create a file named untitled, what I would like to do is check for another file named untitled, if there is one I would like to name the file untitled1 sort of like Word or OpenOffice does.
Anyone know how they do this?
Is it by listing all the files checking for there names and then nameing it according
//pseudo code
get list[] of all files in directory
walk thru files in the array checking for untitled
for each one found increment the counter
then name the file untitled+counter

Answer 1

This is what I have so far, it works but I would like comments or suggestions.
Thanks in advance.
int counter = 0;
newFile = true;
File parentDir = new File("./App");
File subDir = new File("./App/untitled");
if(subDir.exists()){
    File files[] = parentDir.listFiles();
    for(int i = 0; i < files.length; i++){
        String fileName = files.getName();
String name = fileName.substring(0, 3 );
System.out.println(name);
// not crazy about this, it works but I can forsee problems
if( name.equals("unt"))
counter++;
subDir = new File("./App/untitled"+String.valueOf(counter));
subDir.mkdir();
else
subDir.mkdir();