Answer Posted / sri
What is desing pattern?
Commonly accepted solution for a particular problem is
called design pattern.
We can classify the design patterns into two.
1. Java core patterns.
2. J2ee Design patters.
Core patterns.
1) Creational (Factory pattern, singleton pattern....etc)
2) Structural (Adaptor, Composite... etc)
3) Behavioural(Command, Template, Strategy... etc)
Entepise Patterns. (We can catagoize by layer)
1) Business Facade - Business Layer
2) Business Interface - Business Layer
3) DAO pattern - Persistent Layer
4) Composite View - Presentation Layer
5) synchronized - Presentation Layer
6) Service Locator... etc...
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2. Create your own definition of a system. Based on the “system” definitions a. Identify your viewpoint of shortcomings in the definitions. b. Provide rationale as to why you believe that your definition overcomes those shortcomings. c. From an historical perspective, identify three precedented systems that were replaced by unprecedented systems.
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5.Develop an entity relationships diagram that identifies physical entity relationships.
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