What is purpose of inner class in Java?

Inner classes are a security mechanism in Java. We know a class cannot be associated with the access modifier private, but if we have the class as a member of other class, then the inner class can be made private. And this is also used to access the private members of a class.

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A class — in the context of Java — is a template used to create objects and to define object data types and methods . Classes are categories, and objects are items within each category.

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