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

public class GBLTest
{
  public GBLTest ()
  {
    JFrame frame = new JFrame("GBL Test");
    frame.setSize(300,300);
    
    Container content = frame.getContentPane();
    content.setLayout(new GridBagLayout());

    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridheight = 2;
    gbc.gridwidth = 1;
    gbc.fill=GridBagConstraints.VERTICAL;
    setupButton("#1", gbc, content);

    gbc.gridheight = 1;
    gbc.gridwidth = 2;
    gbc.gridx = 1;
    gbc.gridy = 0;
    gbc.fill=GridBagConstraints.HORIZONTAL;
    setupButton("#2", gbc, content);

    gbc.gridwidth = 1;
    gbc.gridx = 1;
    gbc.gridy = 1;
    setupButton("#3", gbc, content);

    gbc.gridx = 2;
    setupButton("#4", gbc, content);

    frame.setVisible(true);
  }
  
  private void setupButton(String label, GridBagConstraints c, Container container)
  {
    JButton b = new JButton(label);
    ((GridBagLayout) container.getLayout()).setConstraints(b, c);
    container.add(b);
  }

  public static void main(String[] args)
  {
    new GBLTest();
  }
}