What defines the design of all classes?

There are three ways to design classes: by composition, via inheritance, and via interface . Composition (or aggregation) is achieved by using existing class as a part of a new class. For example, the ArrayStack class includes an array of objects. Inheritance allows you to define a new class in terms of an old class.

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What is the relation and difference between class and object?

What is the difference between Class and Object? ClassObjectA class is a group of similar objects.Object is a real-world entity such as book, car, etc.Class is a logical entity.Object is a physical entity.Class can only be declared once.Object can be created many times as per requirement.What is the difference between Class and Object? Explained dare2compete.com › blog › difference-between-class-and-object

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