1109: Mainline

To produce the display shown in Segment 1108, you first set the minimum and preferred sizes to 0 in the definition of the IndifferentButton button component:

import java.awt.*; 
import javax.swing.*; 
public class IndifferentButton extends JButton { 
 public IndifferentButton (String t) { 
  super(t); 
 } 
 public Dimension getMinimumSize() {return new Dimension(0, 0);} 
 public Dimension getPreferredSize() {return new Dimension(0, 0);} 
} 

Then, you insert adjustments to the gridx and gridy parameters:

import java.awt.*;
import javax.swing.*;
public class TestPanel extends JPanel {
 public TestPanel () {
  GridBagLayout gbl = new GridBagLayout();
  setLayout(gbl);
  GridBagConstraints gbc = new GridBagConstraints();
  // Fill both ways:
  gbc.fill = GridBagConstraints.BOTH;
  // Allow expansion of all components:
  gbc.weightx = 2.0;
  gbc.weighty = 1.0;
  // Place components:
  placeComponent(0, 0, 1, 2, "A", gbl, gbc);
  placeComponent(0, 2, 1, 3, "C", gbl, gbc);
  gbc.weightx = 1.0;                            
  placeComponent(1, 0, 1, 1, "B", gbl, gbc);
  placeComponent(1, 1, 1, 4, "D", gbl, gbc);
  gbc.weightx = 3.0;                            
  placeComponent(2, 0, 1, 1, "E", gbl, gbc);
  placeComponent(2, 1, 1, 1, "F", gbl, gbc);
  gbc.weighty = 2.0;                            
  placeComponent(2, 2, 1, 1, "G", gbl, gbc);
  gbc.weighty = 1.0;                            
  placeComponent(2, 3, 1, 1, "H", gbl, gbc); 
  placeComponent(2, 4, 1, 1, "I", gbl, gbc); 
 } 
// Definition of placeComponent as in Segment 1106 
}