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676: Sidetrip

You should never mix heavyweight and lightweight components; a heavyweight component will always hide all lightweight components that occupy the same display area. If your program creates, for example, an instance of the JPopupMenu class, you will not see that instance if it lies in an area covered by a heavyweight component, such an instance of the Canvas class.

Accordingly, you should do your drawing and text layout on instances of the JComponent class, rather than of the Canvas class, even though the name might pull you toward the Canvas class.