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Protocol (object-oriented programming)
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- Snippet from Wikipedia: Interface (object-oriented programming)
In object-oriented programming, an interface or protocol type is a data type that acts as an abstraction of a class. It describes a set of method signatures, the implementations of which may be provided by multiple classes that are otherwise not necessarily related to each other. A class which provides the methods listed in an interface is said to implement the interface, or to adopt the protocol.
If objects are fully encapsulated then the interface is the only way in which they may be accessed by other objects. For example, in Java, the
Comparableinterface specifies a methodcompareTo()which implementing classes must implement. This means that a sorting method, for example, can sort a collection of any objects of types which implement the Comparable interface, without having to know anything about the inner nature of the class (except that two of these objects can be compared by means ofcompareTo()).
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