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Util class

 
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Can somebody tell me that how much should I cover in the java util and what type of questions on collections are there.
Thanks in advance.
Mahesh
 
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on my exam there were 5 util questions. it is definately worth remembering what these words mean:
Tree -- ordered
Sorted -- err.. sorted!
Set -- no duplicates.
Hash -- errr.. can't remember -- anybody?
Map -- have a key (have a mapping)
as most of my questions were based around: if you want to create a collection with these features which of the following would you use...
it is also remembering important methods such as put and add and where they are appropriate
also note where null can be used and where it cannot be used.
 
Mahesh Bansal
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Thanks
Mahesh
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