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Abstract Classes
Abstract Classes
referred to as an incomplete base class
cannot be instantiated, can only be sub-classed.
Implementation The subclass inheriting the abstract class has to override and implement the abstract methods
https://gist.github.com/2373593
Inheritance
Purpose
A subclass in C# cannot inherit two or more base class.
Interfaces
contains only abstract members
cannot implement any methods
cannot be instantiated
by default, all members have public as the access modifier
cannot contain constants, data fields, constructors, destructor and static members
Implemetation
https://gist.github.com/e63d1cf32b03cd888686
Mutiple Inheritance
https://gist.github.com/7856dad9ccfe58aaa0da
Interface Inheritance
An interface can inherit multiple interfaces but cannot implement
them.
https://gist.github.com/2374963
What difference between abstract classes & Interfaces?
Short
Interface: contract only, no implementation, no instantiation
Abstract class: contract, some implementation, no instantiation
Interface specifying what the object can do
Abstract specify what an object is
Similarities
cannot be instantiated
are implemented by the inheriting subclass
can inherit multiple interfaces
Differences
Some stories
Recommendations
Multiple version of component => Abstract class
functionality will be useful across a wide range of disparate objects
=> Interfaces
small, concise function bits of functionality => Interfaces
common, implemented functionality among all implementations of your component => Abstract class
