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Programs are composed of a set of modules called classes. Each class is a template specifying a set of behaviors on the data of the class.
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Each class has class variables (sometimes called instance vars) to hold the data and methods (called functions or procedures in other languages) to define the behaviors. Each object in a program is created as an instance of a class. Each class instance has its own copy of the class variables.
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Classes can be used for data encapsulation, hiding the details of the data representation from the user of the class (by marking variables as private).
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Instance
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Variables
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Methods
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