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HFSJ some questions

Rene Lee
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Just finished reading the book/except the mock exam and trying to digest the stuffs.

Have some questions on the way,

Enterprise Design Pattern
I read the chapter and was confuse, the mock exam questions did not telly with the descriptions of the design patterns mentioned in the chapter. Is there a simplier way to understand what these patterns does?
Like transfer Object is mostly use to reduce network traffic.
Do we have to memorize stuffs like
MVC: Views can Change independently from contorllers and models
Model componenets hide internal details from view....
Model adheres to strict contract ...
I find it difficult to remember these stuffs maybe because I don't use the terms regularly. But if given a function and identifying the pattern, it'll be easier.

Also I read that there are drag and drops in the exam, I'm actually worried over that as it'll probably have higher points and is a if 1 wrong whole question wrong thing, what type of questions can we expect for drag and drops?

ok back to mock exam study. Thanks.
It is sorta covered in the JavaRanch Style Guide.
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