Object-Oriented Design - Java Software Solutions: Foundations of Program Design - page 363

LISTING 7.23
//********************************************************************
// BoxPanel.java Author: Lewis/Loftus
//
// Represents the panel in the LayoutDemo program that demonstrates
// the box layout manager.
//********************************************************************
import java.awt.*;
import javax.swing.*;
public class BoxPanel extends JPanel
{
//-----------------------------------------------------------------
// Sets up this panel with some buttons to show how a vertical
// box layout (and invisible components) affects their position.
//-----------------------------------------------------------------
public BoxPanel()
{
setLayout ( new BoxLayout (this, BoxLayout.Y_AXIS));
setBackground (Color.green);
JButton b1 = new JButton ("BUTTON 1");
JButton b2 = new JButton ("BUTTON 2");
JButton b3 = new JButton ("BUTTON 3");
JButton b4 = new JButton ("BUTTON 4");
JButton b5 = new JButton ("BUTTON 5");
add (b1);
add (Box.createRigidArea ( new Dimension (0, 10)));
add (b2);
add (Box.createVerticalGlue());
add (b3);
add (b4);
add (Box.createRigidArea ( new Dimension (0, 20)));
add (b5);
}
}