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As indicated in the class hierarchy shown in Segment 670,
JFrame is a subclass of Frame; JApplet is
a subclass of Applet; JComponent is a subclass of
Component; and JPanel is a subclass of
JComponent.
Each of the classes beginning with the letter J is called a
swing class. Swing classes were developed later than
their nonswing superclasses, and because they offer more features
and more flexibility, you should use them rather than nonswing
analogs.