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669: Mainline

GUI is an acronym for graphical user interface. Much of the work involved in constructing a GUI centers on the creation of class instances that have a graphical representation, which, in the vernacular of Java, are called components. Java's component catalog includes components such as buttons, choice lists, and text fields.

Certain components allow you to nest other containers inside their boundaries; such components are called containers.

A window is a container's graphical representation. Informally, window is used as a synonym for container.