How to enumerate File list

Hi,

In my SourceCP class:
I have say three methods:

void initialize();
File getCurrentFile();
File getNextFile();


In my initialize() method:
I get the file directory and list the files under that directory.
I want to get the files that has certain names such as files that has the subString FEEDBACK

In my getCurrentFile method:
I want to get the first file in the list under the directory - as I found in initialize()

In my getNexttFile method:
I want to get the next file in the list under the directory - as I found in initialize()


In my Source class:
I want to get the current file ... then the next file.. and thus process them...

How do I go about coding the above methods?
I tried certain ways - didn't work...

Here is what I tried:

public class SourceCP{

   File currentFile = null;
   File filePath = null;
   String subString = null;
   String[] fileNames = null;
   int totalFiles = 0;
   int currentFileIndex = 0;

public void initialize(){
   filePath = new File(ConfigParameters.getInstance().getDataFilePath());  //from XML - works ok
   subString = ConfigParameters.getInstance().getFileNameSubString(); //from XML - works ok - to get  
                                                                                            // type of files I want to work with within this directory

  Now  I want to list the files within this directory that has the fileNameSubString String.
  I want to assign the currentFIle to the first index within this list - such that in my getNextFile I can increment it.
  The method getNextFile illustrates what I really want to do...
  Here I want to store all the file names in an array.
  Use an index to assign the first file in the array in currentFile.
  get a total of the files.

}


public File getCurrentFile(){

return currentFile;
}


public  File getNextFile()
          {
        File lReturnFile = null;

       if (++currentFileIndex < totalFiles)
        {
            currentFile =  new File(ConfigParameters.getInstance().getDataFilePath() +
                                    fileNames[currentFileIndex]);
        }
        else
        {
            currentFile = null;
        }
   
        return currentFile;
    }


}

Let me know how to go about this!!
I gave full points since it needs some real contribution than some mere links :)

Let me know if you need further clarificaiton...


Thanks..
_Esam.