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essential packages

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hi ..hope this isnt silly question..what are essential package you should know..what an employer aspects you to know...i know lang is essential..i am talking on the whole..
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Packages?

Hm... Actually I know 40% of the API. I guess that non of it is obrigatory for you to know - a simple search at Google and you can find the documentation.

Now, other packages (for Graphics, 3D stuff) it'll depend of your project. I guess that for Graphics one of the best is JFreeChart. For 3D, JMonkey Engine and for image processing, JAI.

I couldn't answer your question very well because I did not understand it.
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You mean just the names of the packages? Did any one ask you this in an interview?
Generally, in my point of view, knowledge lies in abstraction than in detials.
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I'd say the two packages you can't live without are java.lang and java.util. For the rest it is up to the code you're developing:
- java.io for file / stream code
- java.net for network code
- java.awt and javax.swing and their subpackages for user interfaces

Those are the packages I use most often.
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java.lang and java.utils and especially a very good overview of the Collecions Framework are essential IMO
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