Please clarify on these queries(tricky questions)...Waiting for Help

Hi Guys,
Can you please clarify me on the below queries please,these are all like Trickey questions
{color:#000080}*1)How to Design a datastructure that will hold <{color:#800080}value,key{color}>, if you give the value it will return key.*
*2)If we have package dependency then we need to prefer interface or abstract class? and why*
*3)An array has 1000 elemnets how to find a particular number in effective way.*
*4)If we have 1000 elements in HashMap, How to optimise*
{color}
Please help me on this.
Hoping for your reply..
Thanks In Advance,
Anji

Do your own homework.
[_How to ask questions the smart way_|http://catb.org/~esr/faqs/smart-questions.html]
db

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