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Collection is the root of the collection hierarchy. It defines operations on
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HashMap is an implementation of Map. All optional operations are supported.All
elements are permitte
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An iterator over a sequence of objects, such as a collection.If a collection has
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Walk the nodes of the tree left-to-right or right-to-left. Note that in
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An int value that may be updated atomically. See the java.util.concurrent.atomic
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