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| − | [[Category:OOP]] | + | [[Category:IAM Classes]] |
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| − | ==Interfaces==
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| − | Interfaces - implements or derives from
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| − | 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.
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| − | You cannot create an instance of an interface.
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| − | Interfaces cannot contain any implementation.
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| − | 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.
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| − | In order to specify that a class implements an inteface you use a : after the class name:
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| − | <csharp>public class NewDog : IWalkable</csharp>
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| − | This means that the NewDog class implements the IWalkable interface.
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| − | Interfaces support multple inheritance.
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| − | <csharp>public class NewDog : IWalkable,IBark</csharp>
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| − | Now the NewDog Class promises to implement the IWalkable and the I Bark interface.
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| − | Phone interface example with single inhertance
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| − | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/phoneIFace.cs phoneIFace.cs] -source
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| − | Multiple interface inheritance - inherits IPhone, Cell, POTS
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| − | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/phoneIFacePOTS.cs phoneIFacePOTS.cs] -source
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| − | Phone Interface UML
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| − | [[Image:PhoneInterface.png]]
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| − | ===IComparable and Polymorphism===
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| − | In order to allow build in Arry type like the ArrayList to be able to Sort and Reverse your classes need to implement the IComparable Interface.
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| − | [http://msdn2.microsoft.com/en-US/library/system.icomparable.aspx System.IComparable on MSDN]
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| − | After your classes implement this interface it will allow for polymorphic method like Sort and Reverse to work.
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| − | Here is an exmaple of a dog array that will not sort
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| − | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/DogCompare/dogSimple.cs dogSimple.cs]
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| − | This IComplare Interface has calls for a methpod called CompareTo. The CompareTo method shoudl retun an positive integerg if that the current object is grater that the object that is being compared.
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| − | It should oreturn 0 is they are equal.
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| − | And it should return a negative integer is the current object is less than the compared object.
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| − | The UML for IComparable<br/>
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| − | [[Image:IComparable.png]]
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| − | The UML for a dog that implemets IComparable
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| − | [[Image:DogIComparable.png]]
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| − | Now here is an example of a Dog class that implements the IComparable inteface.
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| − | [http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class8/DogCompare/dogICompare.cs dogICompare.cs]
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| − | ===Other Resources on Interfaces===
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| − | [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]
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| − | [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]
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| − | ==Anatomy of an aspx page==
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| − | Page Direcive
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| − | Console applications start executing in the main method
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| − | <csharp>public static void Main() {}</csharp>
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| − | The .Net Framework can also execute on the web. Rather than having a Main method a web page starts it's execution with a method called Page_Load
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| − | <csharp>public Page_Load { }</csharp>
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| − | There are actually several method that are exeuted in an aspx page.
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| − | ==Dogs on the web==
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| − | [http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class8/DogWeb DogWeb]
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| − | ==Courses on the Web==
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| − | [http://iam.colum.edu/oop/browser/browser.aspx?f=/classsource/class8/StudentWeb Student Web]
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