Some questiong about Data Structures in Java

1. A Heap is defined as a special kind of BinaryTree and a BinarySearchTree is a kind of BinaryTree, yet neither of these two containers is an extension of BinaryTree, Explain Why.

2. For any Container to be useful, we must be able to add and remove objects, yet Container does not define any commands for adding and removing, Why?

3. In terms of accessing all the elements in a container, how does an Iterator object offer an advantage over simple query methods that actually iterate through all objects in the container for you? When is it better to use a simple query as opposed to returning an Iterator?

4. If Java provided the capability for generic types, how would the Container hierarchy be affected? Specially, how would interface Container change?

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these questions are excersices of book "Fundemantals of OOP & Data Structures in Java"

Javid: You need to try to answer these questions yourself. If there is a specific question/doubt/problem, then the forum will help you. The forum won't answer these type of questions until you show some effort and have specific questions.
CJSL

heh. but java DOES enable generic types. your book is old.

If you tale those question from a book, all the concepts should well explained there. Read it well and try to find the solution your self. Seems that you didn't put any attempt. If so, what are your answers, put them here so I can comment on that.

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Originally Posted by CJSLMAN

Javid: You need to try to answer these questions yourself. If there is a specific question/doubt/problem, then the forum will help you. The forum won't answer these type of questions until you show some effort and have specific questions.
CJSL

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I know I have to answer these questions myself, but there were 12 questions, & these four are remaining! I don't know the answers for these and didn't find them in the book! I will be thankful if you guide me or give me a resource to find my answers in it! :)

If the book doesn't have the answers (which I find odd), google it. I did and found info on at least two of the questions. Hint: go look at the Java Container class methods.
CJSL