An Example of the Grid Bag Layout in Java

GridBagLayoutExample.java

/* Modified from Listing 10-1 in
   The Definitive Guide to Java Swing
   by John Zukowski. 
*/

import java.awt.*;
import javax.swing.*;

public class GridBagLayoutExample {
    private static final Insets insets = new Insets(0, 0, 0, 0);
    private static final Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    private static final int width = 500;
    private static final int height = 200;

    public static void main(final String[] args) {
        Runnable runner = () -> {
            final JFrame frame = new JFrame("GridBagLayout");
            frame.setLocation(
                    (int) screenSize.getWidth() / 2 - width / 2, (int) screenSize.getHeight() / 2 - height / 2);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(new GridBagLayout());
            JButton button;

            // Row One - Three Buttons
            button = new JButton("One");
            addComponent(frame, button, 0, 0, 1, 1);
            button = new JButton("Two");
            addComponent(frame, button, 1, 0, 1, 1);
            button = new JButton("Three");
            addComponent(frame, button, 2, 0, 1, 1);

            // Row Two - Two Buttons, Five will consume two rows.
            button = new JButton("Four");
            addComponent(frame, button, 0, 1, 2, 1);
            button = new JButton("Five");
            addComponent(frame, button, 2, 1, 1, 2);

            // Row Three - Two Buttons
            button = new JButton("Six");
            addComponent(frame, button, 0, 2, 1, 1);
            button = new JButton("Seven");
            addComponent(frame, button, 1, 2, 1, 1);
            frame.setSize(width, height);
            frame.setVisible(true);
        };
        EventQueue.invokeLater(runner);
    }

    private static void addComponent(Container container, Component component,
                                     int gridx, int gridy, int gridwidth, int gridheight) {
        GridBagConstraints gbc =
                new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0, 1.0,
                        GridBagConstraints.CENTER, GridBagConstraints.BOTH, insets, 0, 0);
        container.add(component, gbc);
    }
}