DOT NET Interview Questions - DotNetSpider

Note : To remember structural pattern best is (ABCDFFP)
Behavioral Patterns
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Mediator:-Defines simplified communication between classes.
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Memento:-Capture and restore an object's internal state.
Interpreter:-A way to include language elements in a program.
Iterator:-Sequentially access the elements of a collection.
Chain of Resp:-A way of passing a request between a chain of objects.
Command:-Encapsulate a command request as an object.
State:-Alter an object's behavior when its state changes.
Strategy:-Encapsulates an algorithm inside a class.
Observer:-A way of notifying change to a number of classes.
Template Method:-Defer the exact steps of an algorithm to a subclass.
Visitor:-Defines a new operation to a class without change.
Note :- Just remember Music....... 2 MICS On TV (MMIICCSSOTV).
Note:- No source code is provided for architecture section. As much of the things can be
clear from good UML diagrams.
(A)What’s difference between Factory and Abstract Factory Pattern’s?
Note: - This is quiet a confusing architect question especially in design pattern section.
Interviewer can take you for a nice ride …. So get the difference’s in your heart.
First read the definition provided in the first question about both these patterns. The
common thing they have is that they belong to creational patterns. In short they hide the
complexity of creating objects.
The main difference between factory and Abstract factory is factory method uses
inheritance to decide which object has to be instantiated. While abstract factory uses
delegation to decide instantiation of object. We can say Abstract factory uses factory
method to complete the architecture. Abstract Factory is one level higher in abstraction
over Factory.
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