What iterator Iterator that?
(1) iterative mode . Java is one of the commonly used design patterns. It may be used for sequential access of elements of the set of objects, without having to know the underlying collection of objects implemented.
(2) Iterator is a searchable collection of objects, providing a common user interface for a variety of containers, and isolating the underlying implementation of the traversal of the container, in order to achieve decoupling .
(3) The disadvantage is the need to add new collections with adding new iterator object, pairs increases.
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