14.3 Simple GUI-Based Input/Output with JOptionPane
The applications in Chapters 2–10 display text in 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, an e-mail program allows you to type and read messages in a window the program provides. 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 prebuilt dialog boxes for both input and output. These are displayed by invoking static JOptionPane methods. Figure 14.2 presents a simple addition application that uses two input dialogs
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