My GUI is not working. How can I fix it? (It includes picture on a jbutton.)

public class Drum extends JFrame {
	private JButton hihat,snare,tom1,tom2,base,floortom, ridecymbal,crashcymbal;
	private JLabel label1,label2,label3,label4,label5,label6,label7,label8,label9,part1,part2,part3,part4,part5,part6,part7,part8;
	private ImageIcon I1,I2,I3,I4,I5,I6,I7,I8;
	private JPanel p1,p2;
	public Drum(){
		//Adds a new JFrame
		  JFrame frame= new JFrame("Drumset");
      // So that when you x the GUI, the program will close.
		  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		  Drum panel2 = new Drum();
      // initalizes the contents of frame.
		  frame.getContentPane().add(panel2);
		   // so the frame can be visible.
		  frame.setVisible(true);
		// makes the frame fit the size of the contents
		  frame.pack();
		  // makes the frame visible.
		  frame.setVisible(true);
		 
		  
		//creates the panel
		p1= new JPanel();
		//creates the buttons
	hihat= new JButton();
	// sets button to an image
hihat.setIcon(new ImageIcon("Snare.PNG"));
// adds button to panel
p1.add(hihat);
// adds panel
add(p1);</pre>
}
}

public static void main(String[]
args){
<pre>  JFrame frame= new JFrame("Drumset");
      // So that when you x the GUI, the program will close.
		  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		  Drum panel2 = new Drum();
      // initalizes the contents of frame.
		  frame.getContentPane().add(panel2);
		   // so the frame can be visible.
		  frame.setVisible(true);
		// makes the frame fit the size of the contents
		  frame.pack();
		  // makes the frame visible.
		  frame.setVisible(true);