How to get all filenames of certain file types in a folder?

Hey!

I have built a small program that opens a csv-file and extracts some data from it. The user specify what file to be used by writing the file name in the prompt. How could I change my small program to automatically go over all files in a certain folder, instead of just one file at a time?

Thank you in advance

Is this a non-GUI program? If so, how are you getting the file list, via File#listFiles() method? If so, there's an overload of this method that takes a FileFilter object that you should look into.
Look here: File (Java Platform SE 6)
and here: FileFilter (Java Platform SE 6)

Ah, thanks. I'll take a look there. Yes, its a non-GUI program at the moment. Im using something like new Filereader("file name")...

I found a code that could do what I want, and it does it very good. But I am puzzled over one thing. I have some log files in a folder. All logs that are named 20081001 to 20081031 works great. But if I use files that are not named like this, I get an error saying the file is not present and cannot be open. Any suggestions?

Code:

---

       

List<String> filnamn = new ArrayList();

        File folder = new File("c:/Log");
        File[] listOfFiles = folder.listFiles();

        for (int i = 0; i < listOfFiles.length; i++) {
            if (listOfFiles[i].isFile()) {
                filnamn.add(listOfFiles[i].getName());
                System.out.println(listOfFiles[i].getName());

            }
        }

        for (int i = 0; i <= filnamn.size() - 1; i++) {

            String teststr = filnamn.get(0);
           
            CSVReader csvread = new CSVReader(new FileReader(teststr));
            List<String[]> test = csvread.readAll();
            Filter testfilter = new Filter(test);
        }

---

You should check that each file is a file and not a directory. If that's not the issue, look at the file that is having the problem in debug and see if it has any unusual properties.

append the path to the file name as:

String dir = "c://log";
CSVReader csvread = new CSVReader(new FileReader(dir+"/"+teststr));

note the "/" b4 the filename