Section 12.3 Simple GUI-Based Input/Output with JOptionPane
• Most applications use windows or dialog boxes (p. 476) to interact with the user.
• Class JOptionPane (p. 476) of package javax.swing (p. 474) provides prebuilt dialog boxes for both input and output. JOptionPane static method showInputDialog (p. 477) displays an input dialog (p. 476).
• A prompt typically uses sentence-style capitalization—capitalizing only the first letter of the first word in the text unless the word is a proper noun.
• An input dialog can input only input Strings. This is typical of most GUI components.
• JOptionPane static method showMessageDialog (p. 478) displays a message dialog (p. 476).
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