public Frame(String title) {
    setTitle(title);
     try{
          Clip crit = AudioSystem.getClip();
            AudioInputStream inputStream1 = AudioSystem.getAudioInputStream(this.getClass().getResource("k.wav"));
            crit.open(inputStream1);
            crit.loop(Clip.LOOP_CONTINUOUSLY);
     }        catch(Exception e){
            e.printStackTrace();
        }
    setContentPane(new JLabel(new ImageIcon(Frame.class.getClassLoader().getResource("img/lel.png"))));
    setVisible(true);
    setBounds(600,600,1024,833);
    this.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
    this.setResizable(false);
    setLocationRelativeTo(null);
    addMouseListener(this);
}
I'm trying to figure out how to add the lel.png and k.wav to be inside of the JAR file to make my program work?