getting Panels from a different class to show up in a JFrame in a different class?

Hey, I am trying to get my panels to show up in my JFrame that's in a different class. When I run the program I get a blank frame.

Code :

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	private void initGUI(){
	JFrame frame = new JFrame("Shannons Theorem");
	frame.setSize(350,300);
	ShannonsPanel shannonspanel = new ShannonsPanel(this);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	frame.setVisible(true);
	frame.add(shannonspanel);
}
 
 
 
 
 
package network;
 
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Observable;
import java.util.Observer;
 
import javax.swing.BoxLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
 
public class ShannonsPanel extends JPanel implements Observer {
 
	private ShannonsController controller;
	private ShannonsModel model;
	private JLabel maxDataRateLBL;
 
 
 
public ShannonsPanel(ShannonsController ctl){
 
	ctl.addObserver(this);
	initGUI();
 
 
}
 
public JLabel getMaximumDataRateLBL(){
	return maxDataRateLBL;
 
}
public void setMaximumDataRateLBL(JLabel mdrlbl){
		this.maxDataRateLBL = mdrlbl;
}
 
public  void setController(ShannonsController ctl){
	ctl.addObserver(this);
	this.controller = ctl;
}
 
 
private JPanel createSignalToNoisePanel(){
	JPanel signalToNoisePanel = new JPanel();
	signalToNoisePanel.setLayout(new BoxLayout(signalToNoisePanel, BoxLayout.LINE_AXIS));
	JLabel signalToNoiseLBL = new JLabel("Signal To Noise(in DB):");
	final JTextField signalToNoiseTXTFLD = new JTextField();
 
	signalToNoisePanel.add(signalToNoiseLBL);
	signalToNoisePanel.add(signalToNoiseTXTFLD);
 
	signalToNoiseTXTFLD.addActionListener(new ActionListener(){
 
 
	public void actionPerformed(ActionEvent e) {
		model.setSignalToNoise( Double.parseDouble(signalToNoiseTXTFLD.getText()));
 
	}
	});
 
	return signalToNoisePanel;
 
 
}
 
private JPanel createBandwidthPanel(){
	JPanel bandwidthPanel = new JPanel();
	bandwidthPanel.setLayout(new BoxLayout(bandwidthPanel, BoxLayout.LINE_AXIS));
	JLabel bandwidthLBL = new JLabel("Bandwidth(in hertz):");
	final JTextField bandwidthTXTFLD = new JTextField();
 
	bandwidthTXTFLD.addActionListener(new ActionListener(){
 
 
	public void actionPerformed(ActionEvent e) {
		model.setBandwidth( Double.parseDouble(bandwidthTXTFLD.getText()));
 
 
	}
	});
 
	bandwidthPanel.add(bandwidthLBL);
	bandwidthPanel.add(bandwidthTXTFLD);
 
	return bandwidthPanel;
}
 
private JPanel createBandwidthSliderPanel(){
	JPanel bandwidthSliderPanel = new JPanel();
	JSlider bandwidthSlider = new JSlider();
	bandwidthSlider.setValue(0);
	JLabel bandwidthLBL = new JLabel("Bandwidth(in hertz):");
 
 
	bandwidthSliderPanel.add(bandwidthSlider);
	bandwidthSliderPanel.add(bandwidthLBL);
	bandwidthSliderPanel.setVisible(true);
	return bandwidthSliderPanel;
 
}
 
private JPanel createSignalToNoiseSliderPanel(){
	JPanel signalToNoiseSliderPanel = new JPanel();
	JSlider signalToNoiseSlider = new JSlider();
	signalToNoiseSlider.setValue(0);
	JLabel signalToNoiseLBL = new JLabel("SignalToNoise(in DB)");
 
 
	signalToNoiseSliderPanel.add(signalToNoiseSlider);
	signalToNoiseSliderPanel.add(signalToNoiseLBL);
 
 
	return signalToNoiseSliderPanel;
 
}
private void initGUI(){
 
}
 
 
 
public void update(Observable o, Object arg) {
	// TODO Auto-generated method stub
 
}
 
}

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I think I am supposed to put something in the initGUI of the second class but I am not really sure what...