Executar arquivo dentro de um jar

public class ExecutaAudio
{
    AudioStream as;
    String classpath = System.getProperty("user.dir");
        
    public void init()
    {
        try 
        {       InputStream in = new FileInputStream(getClass().getResource("/files/ringout.wav").getPath());
                as = new AudioStream(in);
                AudioPlayer.player.start(as);           
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        
    }

    public void stop()
    {
        AudioPlayer.player.stop(as);
    }
}