What is the problem of adding music in java GUI programming?

Why can"t I get AudioClip after I write this? Debug is displayed as null

   //
   static  AudioClip musicBirth(String s){
        URL cb = null;
        File f=new File(s);
        try {
            cb=f.toURI().toURL();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        AudioClip audioClip = Applet.newAudioClip(cb);
        return audioClip;
    }


AudioClip JavaSoundAudioClip,


Jan.15,2022
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