1 : a set of objects that share a common behavior. The terms class and type are usually (but not always) interchangeable; a class is a slightly different concept, in that it emphasizes the importance of hierarchies. [SEMATECH] 2 : defines the methods, messages, and properties of a similar group of objects (the objects are instances of the class). Classes themselves may be objects. [SEMATECH] 3 : a template for defining the methods and variables for a particular type of object. All objects of a given class are identical in form and behavior but contain different data in their variables. [SEMATECH]
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