Java™ How to Program, Seventh Edition

11.2. Simple GUI-Based Input/Output with JOptionPane

The applications in Chapters 2–10 display text at the command window and obtain input from the command window. Most applications you use on a daily basis use windows or dialog boxes (also called dialogs) to interact with the user. For example, e-mail programs allow you to type and read messages in a window provided by the e-mail program. Typically, dialog boxes are windows in which programs display important messages to the user or obtain information from the user. Java’s JOptionPane class (package javax.swing) provides prepackaged dialog boxes for both input and output. These dialogs are displayed by invoking static JOptionPane methods. Figure 11.2 presents a simple addition application that ...