title: Java Swing second JFrame layout fill the space?
body: <p>I've been learning to hand write Swing, and have been using the Sun Doc tutorials. I am using a GridLayout and on my first go it made all the buttons fill the available space. On my second go I've implemented a second grid to hold some controls at the top. I'm sure this is something really easy but after reading and playing for ages I can't get the second lower pane to fill with the buttons like it did on my first attempt. Help pls?</p>
  
  <pre><code>package layout;
  import java.awt.*;
  import java.awt.event.*;
  import javax.swing.*;
  
  public class Game extends JFrame {
      GridLayout gameLayout = new GridLayout(6,6);
      JLabel score = new JLabel("Score:");
  
      public Game(String name) {
          super(name);
          setResizable(true);
      }
  
      public void addComponentsToPane(final Container pane) {
          final JPanel mainGameWindow = new JPanel();
          mainGameWindow.setLayout(gameLayout);
          JPanel controls = new JPanel();
          controls.setLayout(new GridLayout(2,4));
  
          //Add buttons to experiment with Grid Layout
          mainGameWindow.add(new JButton("sqrOne1"));
          mainGameWindow.add(new JButton("sqrOne2"));
          mainGameWindow.add(new JButton("sqrOne3"));
          mainGameWindow.add(new JButton("sqrOne4"));
          mainGameWindow.add(new JButton("sqrOne5"));
          mainGameWindow.add(new JButton("sqrOne6")); 
          mainGameWindow.add(new JButton("sqrTwo1"));
          mainGameWindow.add(new JButton("sqrTwo2"));
          mainGameWindow.add(new JButton("sqrTwo3"));
          mainGameWindow.add(new JButton("sqrTwo4"));
          mainGameWindow.add(new JButton("sqrTwo5"));
          mainGameWindow.add(new JButton("sqrTwo6")); 
          mainGameWindow.add(new JButton("sqrThree1"));
          mainGameWindow.add(new JButton("sqrThree2"));
          mainGameWindow.add(new JButton("sqrThree3"));
          mainGameWindow.add(new JButton("sqrThree4"));
          mainGameWindow.add(new JButton("sqrThree5"));
          mainGameWindow.add(new JButton("sqrThree6"));   
          mainGameWindow.add(new JButton("sqrFour1"));
          mainGameWindow.add(new JButton("sqrFour2"));
          mainGameWindow.add(new JButton("sqrFour3"));
          mainGameWindow.add(new JButton("sqrFour4"));
          mainGameWindow.add(new JButton("sqrFour5"));
          mainGameWindow.add(new JButton("sqrFour6"));    
          mainGameWindow.add(new JButton("sqrFive1"));
          mainGameWindow.add(new JButton("sqrFive2"));
          mainGameWindow.add(new JButton("sqrFive3"));
          mainGameWindow.add(new JButton("sqrFive4"));
          mainGameWindow.add(new JButton("sqrFive5"));
          mainGameWindow.add(new JButton("sqrFive6"));        
          mainGameWindow.add(new JButton("sqrSix1"));
          mainGameWindow.add(new JButton("sqrSix2"));
          mainGameWindow.add(new JButton("sqrSix3"));
          mainGameWindow.add(new JButton("sqrSix4"));
          mainGameWindow.add(new JButton("sqrSix5"));
          mainGameWindow.add(new JButton("sqrSix6"));
  
          //Add controls to set up horizontal and vertical gaps
          controls.add(new Label("Match pairs of Promient Tech Heads!"));
          controls.add(score);
          controls.add(new JButton("Solve"));
          controls.add(new JButton("Scrabble")); 
  
          //Process the Apply gaps button press    
          gameLayout.layoutContainer(mainGameWindow);
  
          pane.add(controls, BorderLayout.NORTH);
          pane.add(new JSeparator(), BorderLayout.CENTER);        
          pane.add(mainGameWindow, BorderLayout.SOUTH);
      }
  
      private void setLabelText(String text)
      {
          score.setText(text);
          score.paintImmediately(score.getVisibleRect());
      }
  
  
      private static void createAndShowGUI() {
          //Create and set up the window.
          Game frame = new Game("Game");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          //Set up the content pane.
          frame.addComponentsToPane(frame.getContentPane());
          //Display the window.
          frame.pack();
          frame.setVisible(true);
          frame.setSize(600,600);
          frame.setMinimumSize(new Dimension(400, 400));            
      }
  
      public static void main(String[] args) {
          /* Use an appropriate Look and Feel */
          try {
              //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
              UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
          } catch (UnsupportedLookAndFeelException ex) {
              ex.printStackTrace();
          } catch (IllegalAccessException ex) {
              ex.printStackTrace();
          } catch (InstantiationException ex) {
              ex.printStackTrace();
          } catch (ClassNotFoundException ex) {
              ex.printStackTrace();
          }
          /* Turn off metal's use of bold fonts */
          UIManager.put("swing.boldMetal", Boolean.FALSE);
  
          //Schedule a job for the event dispatch thread:
          //creating and showing this application's GUI.
          javax.swing.SwingUtilities.invokeLater(new Runnable() {
              public void run() {
                  createAndShowGUI();
              }
          });
      }
  }
  </code></pre>