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JFrame is an acronym for Java Frame. Because the
JFrame class is a subclass of the Frame class, the
Window class, and the Container class, as indicated in
Segment 670, you can refer to an instance of the JFrame
class, or instance of subclasses of that class, as a jframe,
frame, window, or container.
You can call a JFrame instance a jframe when you want to be precise;
you can call the same JFrame instance a frame when you are thinking
of it as a foundation for an application; you can call the same
instance a window when you are thinking of it in terms of its
graphical representation; and you can call it a container
when you think of it as a window in which other components appear.