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

  1. #1
    Junior Member
    Join Date
    Feb 2013
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    Default 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.
    	private void initGUI(){
    	JFrame frame = new JFrame("Shannons Theorem");
    	ShannonsPanel shannonspanel = new ShannonsPanel(this);
    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){
    public JLabel getMaximumDataRateLBL(){
    	return maxDataRateLBL;
    public void setMaximumDataRateLBL(JLabel mdrlbl){
    		this.maxDataRateLBL = mdrlbl;
    public  void setController(ShannonsController ctl){
    	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();
    	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()));
    	return bandwidthPanel;
    private JPanel createBandwidthSliderPanel(){
    	JPanel bandwidthSliderPanel = new JPanel();
    	JSlider bandwidthSlider = new JSlider();
    	JLabel bandwidthLBL = new JLabel("Bandwidth(in hertz):");
    	return bandwidthSliderPanel;
    private JPanel createSignalToNoiseSliderPanel(){
    	JPanel signalToNoiseSliderPanel = new JPanel();
    	JSlider signalToNoiseSlider = new JSlider();
    	JLabel signalToNoiseLBL = new JLabel("SignalToNoise(in DB)");
    	return signalToNoiseSliderPanel;
    private void initGUI(){
    public void update(Observable o, Object arg) {
    	// TODO Auto-generated method stub
    I think I am supposed to put something in the initGUI of the second class but I am not really sure what...

  2. #2
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