Why we extend JFrame in java swings? how is it different from code not ...?

how is it different from code nt extending JFrame?
please explain the role of contentpane in both cases?
thanx

Search the net for examples and/or explanations of "inheritance vs composition.
For the role of a contentPane, read the API for interface RootPaneContainer and class JRootPane. The second named API also has a link to the Swing tutorial on How to Use Root Panes.
db

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Why we extend JFrame in java swings? how is it different from code not ...?

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