What is an Interface? An interface is a collection of method definitions (without implementations) and constant values. Advantages of Interfaces Interfaces are useful for: - capturing similarities between unrelated classes without forcing a class relationship - declaring methods that one or more classes are expected to implement Defining an Interface Defining an interface is similar to creating a new class. An interface definition has two components: the interface declaration and the interface body. interfaceDeclaration { interfaceBody } The definition of an interface is a definition of a new reference data type. You can use interface names anywhere in the program, like using any other type name. You cannot instantiate objects of the interface type. It doesn't have a constructor. |
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