how?

public class MorseCodeApp {

    public static void main(String[] args) {
        System.out.println("Enter your text to convert to morse code and play it ");
        InputHandler inputHandler = new InputHandler();
        inputHandler.loopTroughInput();
    }
}

-------------
public class InputHandler {
    private final Map<String, String> letterToMorseCode = Map.ofEntries(
            Map.entry("A", ".-"),
            Map.entry("B", "-..."),
            Map.entry("C", "-.-."),
            Map.entry("D", "-.."),
            Map.entry("E", "."),
            Map.entry("F", "..-."),
            Map.entry("G", "--."),
            Map.entry("H", "...."),
            Map.entry("I", ".."),
            Map.entry("J", ".---"),
            Map.entry("K", "-.-"),
            Map.entry("L", ".-.."),
            Map.entry("M", "--"),
            Map.entry("N", "-."),
            Map.entry("O", "---"),
            Map.entry("P", ".--."),
            Map.entry("Q", "--.-"),
            Map.entry("R", ".-."),
            Map.entry("S", "..."),
            Map.entry("T", "-"),
            Map.entry("U", "..-"),
            Map.entry("V", "...-"),
            Map.entry("W", ".--"),
            Map.entry("X", "-..-"),
            Map.entry("Y", "-.--"),
            Map.entry("Z", "--.."));

    void loopTroughInput() {
        AudioHandler audioHandler = new AudioHandler();
        Scanner input = new Scanner(System.in);
        String userInput = input.nextLine().toUpperCase();
        Matcher matcher = Pattern.compile("([a-zA-Z])").matcher(userInput);
        while (matcher.find()) {
            getMatchingValue(matcher.group(1));
            audioHandler.pathForAudio(matcher.group(1));
        }
    }

    private void getMatchingValue(String key) {
        letterToMorseCode.entrySet().stream().filter(map -> map.getKey().equals(key)).map(Map.Entry::getValue).forEach(morse -> System.out.print(morse + " "));
    }
}
--------------------
public class AudioHandler {

    void pathForAudio(String letter) {
        String filePath = "src/main/resources/" + letter + ".wav";
        audioSetUp(filePath);
        breakBetweenLetters();
    }

    private void breakBetweenLetters() {
        try {
            Thread.sleep(1500);
        } catch (InterruptedException e) {
            System.out.println("Something is wrong with the thread");
        }
    }

    private void audioSetUp(String filePath) {
        try {
            AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(Paths.get(filePath).toFile());
            Clip clip = AudioSystem.getClip();
            clip.open(audioInputStream);
            clip.start();
        } catch (UnsupportedAudioFileException | IOException | LineUnavailableException e) {
            System.out.println("That file is either invalid or there was a mistake during the playing of audio");
        }
    }
}