//file:	GridBag4.java
import java.awt.*;
import javax.swing.*;

public class GridBag4 extends JPanel {
  GridBagConstraints constraints = new GridBagConstraints();

  public GridBag4() {
    setLayout(new GridBagLayout());
    constraints.fill = GridBagConstraints.BOTH;
    constraints.weighty	= 1.0;
    int	x, y; // for clarity
    constraints.weightx	= 0.1;
    addGB(new JButton("one"),	x = 0, y = 0);
    constraints.weightx	= 0.5;
    addGB(new JButton("two"),	++x,   y);
    constraints.weightx	= 1.0;
    addGB(new JButton("three"),	++x,   y);
  }

  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("GridBag4");
    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    frame.setSize(300, 100);
    frame.setLocation(200, 200);
    frame.setContentPane(new GridBag4());
    frame.setVisible(true);
  }
}