public void listMatching(String searchString)
    {
        boolean checker = false;
        for(String filename : files){
            if(checker == false && filename.contains(searchString)){
                // A match.
                System.out.println(filename);
                checker = true;
            }
            else if(checker == false && !filename.contains(searchString)) {
                System.out.println("Files sucks");
                checker = true;
            }
        }
    }