Built in class in Java

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The public interface of a class should contain only operations defined on the class. Classes should be the least dependent as possible. A class hierarchy in the inheritance should be drawn based upon their natural relationship and never imposed. The topmost class should be an abstract class or an interface.

A class definition is a template for objects : it specifies what attributes the objects have and what methods can operate on them. Every object belongs to an object type; that is, it is an instance of a class.