Having trouble getting a second panel to display

Question

My current project in java involves creating 2 JFrames. One frame to accept information from the user, and another frame to display the answer. I can't get the 2nd from to work properly without a ton of errors. After trimming out some of the code for the 2nd jframe, I've managed to get everything to compile, but the 2nd frame is only displaying the last panel out of 4. I've tried fooling around with the code I cut out, but everything I add creates an error. Any help would be greatly appreciated.
import javax.swing.JFrame;
public class BMI
   public static void main (String[] args)
      JFrame frame = new JFrame ("Enter Data");
      frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
      BMIPanel panel = new BMIPanel();
      frame.getContentPane().add(panel);
      frame.pack();
      frame.setVisible(true);
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.Float;
public class BMIPanel extends JPanel
   private JButton computebutton;
   private JTextField nametext, feettext, inchestext, weighttext;
   public BMIPanel()
          computebutton = new JButton ("Compute");
          computebutton.addActionListener (new BMIListiner());
          nametext = new JTextField (20);
          feettext = new JTextField ("Feet", 6);
          inchestext = new JTextField ("Inches", 6);
          weighttext = new JTextField ("Pounds", 6);
          JPanel namepanel = new JPanel();
          JPanel heightpanel = new JPanel();
          JPanel weightpanel = new JPanel();
          JPanel buttonPanel = new JPanel();
          namepanel.add (new JLabel ("Your Name: "));
          namepanel.add (nametext);
          heightpanel.add (new JLabel ("Your Height: "));
          heightpanel.add (feettext);
          heightpanel.add (inchestext);
          weightpanel.add (new JLabel ("Your Weight: "));
          weightpanel.add (weighttext);
          buttonPanel.add (computebutton);
          setLayout (new BoxLayout (this , BoxLayout.Y_AXIS));
          add(namepanel);
          add(heightpanel);
          add(weightpanel);
          add(buttonPanel);
   private class BMIListiner implements ActionListener
      public void actionPerformed (ActionEvent event)
          JFrame BMIframe = new JFrame ("Results");
      BMIframe.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
      float tempinches;
          float BMIndex;
          String namestring = nametext.getText();
          String feetstring = feettext.getText();
          String inchesstring = inchestext.getText();
          String weightstring = weighttext.getText();
            float feetfloat = Float.parseFloat (feetstring);
          float inchesfloat = Float.parseFloat (inchesstring);
          float weightfloat = Float.parseFloat (weightstring);
          tempinches = feetfloat * 12 + inchesfloat;
          BMIndex = (weightfloat/(tempinches * tempinches)) * 703;
          String BMIstring = "" + BMIndex;          
          JPanel namepan = new JPanel();
          JPanel heightpan = new JPanel();
          JPanel weightpan = new JPanel();
          JPanel BMIpan = new JPanel();
          namepan.add (new JLabel ("Your Name: "));
          namepan.add (new JLabel (namestring));
          heightpan.add (new JLabel ("Your Height: "));
          heightpan.add (new JLabel (feetstring));
          heightpan.add (new JLabel (inchesstring));
          weightpan.add (new JLabel ("Your Weight: "));
          weightpan.add (new JLabel (weightstring));
          BMIpan.add (new JLabel ("Your BMI: "));
          BMIpan.add (new JLabel (BMIstring));
            BMIframe.add(namepan);
          BMIframe.add(heightpan);
          BMIframe.add(weightpan);
          BMIframe.add(BMIpan);
      BMIframe.setVisible(true);
}I'm fairly sure this has something to do with the
frame.getContentPane().add(panel);
rame.pack();stuff, but after playing around with it for an hour I can't seem to get the thing to compile. I've tried putting the code in the main program and inside the action listener with no success.

Answer 1

Yes, but you need to use a suitable LayoutManager for the JFrame too (for the JFrame's contentpane, to be more precise). Your code worked fine when I modified your actionPerformed method like so:
        // Set the frame's LayoutManager:
        BMIframe.setLayout( new GridLayout(4, 1) );
        BMIframe.add(namepan);
        BMIframe.add(heightpan);
        BMIframe.add(weightpan);
        BMIframe.add(BMIpan);
        // Call pack on the frame to make it its preferred size
        BMIframe.pack();
        BMIframe.setVisible(true);