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June 27, 2002 Defining a Polymorphic Interface Tips: June 2002
Yehuda Shiran, Ph.D.
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Polymorphism can be and very often is implemented with interfaces. We have shown how to define interfaces in Column 110. Interfaces differ from classes in that they don't include any implementation. You cannot extend an interface. You can only implement an interface by another class. You cannot create objects from an interface, only from classes that implement interfaces. To support polymorphism, define an interface that accepts an object of the type Object, and implement it in classes that support actual types as int, double, and user-defined classes. Interface names usually start with I, to distinguish them from classes.
The following example defines the
The class CopyInt implements the ICopyObj interface for integers. It includes one property (i), and two methods. One method is the class constructor, CopyInt(). The other method is the interface method, Copy():
To learn more about JScript .NET, go to Column 111, JScript .NET, Part V: Polymorphism.
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