final/src/SoundWrapper.java

import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;
import java.io.*;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.*;

public class SoundWrapper implements Serializable {
    transient public Sound sound;
    public String soundString;

    public static Sound grass;

    static {
        try {
            grass = new Sound("sound/grass.wav");
        } catch (UnsupportedAudioFileException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        } catch (LineUnavailableException e) {
            throw new RuntimeException(e);
        }
    }

    // please note that not as many constructors were implemented as BufferedImage, as this class was created before most sounds were added;
    // as such, backwards compatibility was not needed
    public SoundWrapper(String soundLocation) throws UnsupportedAudioFileException, LineUnavailableException, IOException {
        sound = new Sound(soundLocation);
        soundString = soundLocation;
    }

    public SoundWrapper() {}

    @Serial
    private void writeObject(ObjectOutputStream out) throws IOException {
        out.writeObject(soundString);
    }

    @Serial
    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException, UnsupportedAudioFileException, LineUnavailableException {
        Object o;
        o = in.readObject();
        sound = new Sound((String)o);
    }
    public static void playSound(String filePath) throws UnsupportedAudioFileException, LineUnavailableException, IOException {
        Sound sound = new Sound(filePath);
        if (sound == null) {
            try {
                sound = new Sound(filePath);
            } catch (UnsupportedAudioFileException | LineUnavailableException | IOException e) {
                throw new RuntimeException(e);
            }
        }
        sound.start();
    }

}