[Ex094]

In the GUI you must have a button in order to select the wordlist, now when the user selects the wordlist just read that file.

For Reading/Writing: https://docs.oracle.com/javase/tutorial/.../file.html

Now for the compare part:

Code:

try (BufferedReader reader = Files.newBufferedReader(file, charset)) {
    String line = null;
    while ((line = reader.readLine()) != null) {
        String hash = md5(line); //Use some library for MD5 conversion
        if(hash == hashToCrack) {
               System.out.println("Found a possible match! Word is: " + line);
               break;
        }
    }
} catch (IOException x) {
    System.err.format("IOException: %s%n", x);
}

Java Docs are your friend dude, use em. Plus Stack Overflow too