HashSet and TreeSet

I wouldd like to know about HashSet and TreeSet.

I read TreeSet we can add only similar type of object whereas in HashSet we can add any type of objects. I was not clear on that. When, how, why we use each of them. thanks in advance
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gudii9Asked:
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for_yanCommented:
TreeSet is always  ordered - so the method to compare elements with each other should be defined for the elements, no if they are completely different it is hardly possible
HashSet is not ordered - so all different objects can be elements of the same HashSet
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for_yanCommented:
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