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library class in java

Hi,

I was reading as below

All the library classes are organized in several packages. For a class to use such
library classes, it needs to import them using the import statement


Using packages provides access control to classes.

I would like to know what it means by library class. How library class is different from regular java class(with or without main statement).

How access control is provided by packages?

Please advise
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CPColin
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