can u please explain real time example of abstract class and interface

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can u please explain real time example of abstract class and interface . I know the difference between them but Still I am not understand in which situation abstract class is use and in which situation interface is used

Posted 25-Nov-15 2:13am

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PIEBALDconsult 25-Nov-15 8:30am

Not even Microsoft seems to know that.

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An abstract class allows you to derive a "concrete" class which inherits a set of core functionality: in much the same way as "a Car" in the real word is an abstract object, but "a Ford Fiesta" allows you to drive to the shops. The "Ford Fiesta" class inherits a set of expectations that are common to all Cars: it will have four wheels, an engine, and a place for a driver to sit and control it's speed and direction. But you can't walk into a dealership and buy "a car" - you have to go there expecting to get a specific make and model of car: "Ford" and "Fiesta" and from there decide on an engine size and type, a trim level, and so forth.

An Interface is different: it doesn't allow you to inherit any existing behaviours but enforces that you must do some things in the right way - it's a contract rather than a base class. In the real world, think of an Interface as the membership of a club: provided you pay your dues on time, and follow the club rules you can remain a member and get the benefits of such membership. But there is nothing stopping you from joining a second club at the same time - provided you can also obey its rules, and pay its dues.

Posted 25-Nov-15 2:36am

OriginalGriff

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Andy Lanng · Accepted Answer · 2015-11-25T02:23:00

An Interface is a class signature. It does not contain any functionality and cannot hold values. It is used to ensure that classes implementing the interface have the signature methods and/or properties, which can then be called by a calling function.

An Abstract class can contain functionality but, like an interface cannot be instantiated. You can have static methods that don'r require and instance or you can inherit from it knowing that the core functionality is available.

That's the basic. There is much more detail and many examples on google