Object-Oriented Design - Java Software Solutions: Foundations of Program Design - page 352

LISTING 7.18
//********************************************************************
// LayoutDemo.java Author: Lewis/Loftus
//
// Demonstrates the use of flow, border, grid, and box layouts.
//********************************************************************
import javax.swing.*;
public class LayoutDemo
{
//-----------------------------------------------------------------
// Sets up a frame containing a tabbed pane. The panel on each
// tab demonstrates a different layout manager.
//-----------------------------------------------------------------
public static void main (String[] args)
{
JFrame frame = new JFrame ("Layout Manager Demo");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
JTabbedPane tp = new JTabbedPane();
tp.addTab ("Intro", new IntroPanel());
tp.addTab ("Flow", new FlowPanel());
tp.addTab ("Border", new BorderPanel());
tp.addTab ("Grid", new GridPanel());
tp.addTab ("Box", new BoxPanel());
frame.getContentPane().add(tp);
frame.pack();
frame.setVisible( true );
}
}
Flow Layout
Flow layout is one of the easiest layout managers to use. The JPanel class uses
flow layout by default. Flow layout puts as many components as possible on a
row, at their preferred size. When a component cannot fit on a row, it is put on
the next row. As many rows as needed are added to fit all components that have
been added to the container. Figure 7.7 depicts a container governed by a flow
layout manager.
The class in Listing 7.20 represents the panel that demonstrates the flow lay-
out in the LayoutDemo program. It explicitly sets the layout to be a flow layout