Question: 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

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?

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?

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