Java™ How To Program (Early Objects), Tenth Edition

12.19 Using Panels to Manage More Complex Layouts

Complex GUIs (like Fig. 12.1) often require that each component be placed in an exact location. They often consist of multiple panels, with each panel’s components arranged in a specific layout. Class JPanel extends JComponent and JComponent extends class Container, so every JPanel is a Container. Thus, every JPanel may have components, including other panels, attached to it with Container method add. The application of Figs. 12.45–12.46 demonstrates how a JPanel can be used to create a more complex layout in which several JButtons are placed in the SOUTH region of a BorderLayout.

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 1   // Fig. 12.45: PanelFrame.java 2   // Using a JPanel to help lay out components. ...