|
|
| (50 intermediate revisions by 3 users not shown) |
| Line 1: |
Line 1: |
| − | [[Category:OOP]] | + | [[Category:IAM Classes]] |
| − | | + | MIDTERM |
| − | ==Interfaces==
| |
| − | | |
| − | Interfaces - implements or derives from
| |
| − | | |
| − | An interface is a class that lacks implementation. The only thing it contains are definitions of events, indexers, methods and/or properties. The reason interfaces only provide definitions is because they are inherited by classes and structs, which must provide an implementation for each interface member defined. Since classes in c# can only be derived from one other class ( in c++ it is possible to derive from many) interfaces are used for multiple inheritance. Like abstract classes you cannot create an instance of an interface on derive from it.
| |
| − | | |
| − | You cannot create an instance of an interface.
| |
| − | | |
| − | Interfaces cannot contain any implementation.
| |
| − | | |
| − | Interfaces are basically a contract between classes. When a class implements an interface it is promising to implement the propery and method signature of that interface. This helps with abstraction and encurages polymorphism.
| |
| − | | |
| − | Phone interface example
| |
| − | | |
| − | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/phoneIFace.cs phoneIFace.cs] -source
| |
| − | | |
| − | Multiple interface inheritance - inherits IPhone, Cell, POTS
| |
| − | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/phoneIFacePOTS.cs phoneIFacePOTS.cs] -source
| |
| − | | |
| − | [http://ia300218.us.archive.org/2/items/arsdigitac04n04/Lecture_04.html ArsDigita University Course 04: Object-oriented Program Design and Software Engineering - Lecture Notes 4]
| |
| − | | |
| − | [http://ia300218.us.archive.org/2/items/arsdigitac04n05/Lecture_05.html ArsDigita University Course 04: Object-oriented Program Design and Software Engineering - Lecture Notes 5]
| |
