What's the difference between Component's isDisplayable() and isVisible() ?

hi,
I have a question about java.awt.Component.
Is there difference between isDisplayable() and isVisible() ?
can you help me ?
thanks.

thank you very much.
sorry, i am a new commer in Swing.
What the meaning of "a native screen resource" according to
isDisplayable() description?
thanks a lot

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