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

public class TestGridBagLayout extends JFrame {

    public TestGridBagLayout() {
	super("GridBagLayout");

	Container c = getContentPane();
	GridBagLayout gbl = new GridBagLayout();
	GridBagConstraints constraints = new GridBagConstraints();
	c.setLayout(gbl);

	constraints.fill = GridBagConstraints.HORIZONTAL;

	JButton b = new JButton("Bouton 1");
	constraints.gridx = 0;
	constraints.gridy = 0;
	constraints.ipadx = 10;
	constraints.ipady = 10;
	gbl.setConstraints(b, constraints);
	c.add(b);

	b = new JButton("2");
	constraints.gridx = 1;
	constraints.gridy = 1;
	constraints.ipadx = 0;
	constraints.ipady = 0;
	constraints.insets = new Insets(10, 0, 20, 0);
	constraints.weightx = 1.0;
	gbl.setConstraints(b, constraints);
	c.add(b);

	b = new JButton("Mon troisième bouton");
	constraints.gridx = 2;
	constraints.gridy = 2;
	Insets insets = constraints.insets;
	insets.top = insets.bottom = insets.left = insets.right = 0;
	constraints.weightx = 0.0;
	constraints.weighty = 1.0;
	gbl.setConstraints(b, constraints);
	c.add(b);

	b = new JButton("Le quatrième");
	constraints.gridx = 0;
	constraints.gridwidth = 3;
	constraints.gridy = 4;
	constraints.weightx = 0.0;
	constraints.weighty = 0.0;
	constraints.anchor = GridBagConstraints.SOUTH;
	gbl.setConstraints(b, constraints);
	c.add(b);

	addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    public static void main(String [] args) {
	JFrame tgbl = new TestGridBagLayout();
        tgbl.pack();
        tgbl.setVisible(true);

    }
}