boxpanel.java

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//********************************************************************
//  BoxPanel.java       Authors: 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);
   }
}