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 are the contents of class?

Key contents of class are identifiers, body . The body of a class is made up of one or more members. Members consist of variables fields and the things it does are called methods.Is a class considered an object? According to Savitch (2015), “A class is the definition of a kind of object”.

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What classes contain?

A class contains data field descriptions (or properties, fields, data members, or attributes) . These are usually field types and names that will be associated with state variables at program run time; these state variables either belong to the class or specific instances of the class.

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