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Encapsulation is a programming mechanism that binds together code and the data it manipulates, and keeps both safe from outside interference and misuse In an object-oriented language, code and data can be bound together in such a way that a self-contained black box is created Within the box are all necessary data and code When code and data are linked together in this fashion, an object is created In other words, an object is the device that supports encapsulation Within an object, code, data, or both may be private to that object or public Private code or data is known to and accessible by only another part of the object That is, private code or data
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cannot be accessed by a piece of the program that exists outside the object When code or data is public, other parts of your program can access it, even though it is defined within an object Typically, the public parts of an object are used to provide a controlled interface to the private elements of the object C# s basic unit of encapsulation is the class A class defines the form of an object It specifies both the data and the code that will operate on that data C# uses a class specification to construct objects Objects are instances of a class Thus, a class is essentially a set of plans that specify how to build an object The code and data that constitute a class are called members of the class Specifically, the data defined by the class is referred to as member variables or instance variables The code that operates on that data is referred to as member methods or just methods Method is C# s term for a subroutine If you are familiar with C/C++, it may help to know that what a C# programmer calls a method, a C/C++ programmer calls a function Because C# is a direct descendent of C++, the term function is also sometimes used when referring to a C# method
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Polymorphism (from Greek, meaning many forms ) is the quality that allows one interface to access a general class of actions A simple example of polymorphism is found in the steering wheel of an automobile The steering wheel (the interface) is the same, no matter what type of actual steering mechanism is used That is, the steering wheel works the same whether your car has manual steering, power steering, or rack-and-pinion steering Thus, turning the steering wheel left causes the car to go left no matter what type of steering is used The benefit of the uniform interface is, of course, that once you know how to operate the steering wheel, you can drive any type of car The same principle can also apply to programming For example, consider a stack (which is a first-in, last-out list) You might have a program that requires three different types of stacks One stack is used for integer values, one for floating-point values, and one for characters In this case, the algorithm that implements each stack is the same, even though the data being stored differs In a non object-oriented language, you would be required to create three different sets of stack routines, with each set using different names However, because of polymorphism, in C#, you can specify the general form of a stack once and then use it for all three specific situations This way, if you know how to use one stack, you can use them all More generally, the concept of polymorphism is often expressed by the phrase one interface, multiple methods This means that it is possible to design a generic interface to a group of related activities Polymorphism helps reduce complexity by allowing the same interface to be used to specify a general class of action It is the compiler s job to select the specific action (that is, method) as it applies to each situation You, the programmer, don t need to do this selection manually You need only remember and utilize the general interface
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