//file:	GridBag3.java
import java.awt.*;
import javax.swing.*;

public class GridBag3 extends JPanel {
  GridBagConstraints constraints = new GridBagConstraints();

  public GridBag3() {
    setLayout(new GridBagLayout());
    constraints.weightx	= 1.0;
    constraints.weighty	= 1.0;
    constraints.fill = GridBagConstraints.BOTH;
    int	x, y;  // for clarity
    constraints.gridheight = 2;	// span	two rows
    addGB(new JButton("one"),	x = 0, y = 0);
    constraints.gridheight = 1;	// set it back
    addGB(new JButton("two"),	x = 1, y = 0);
    addGB(new JButton("three"),	x = 2, y = 0);
    constraints.gridwidth = 2; // span two columns
    addGB(new JButton("four"),	x = 1, y = 1);
    constraints.gridwidth = 1; // set it back
  }

  void addGB(Component component, int x, int y)	{
    constraints.gridx =	x;
    constraints.gridy =	y;
    add(component, constraints);
  }

  public static	void main(String[] args) {
    JFrame frame = new JFrame("GridBag3");
    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    frame.setSize(200, 200);
    frame.setLocation(200, 200);
    frame.setContentPane(new GridBag3());
    frame.setVisible(true);
  }
}