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Powerful
tool for programming data structures
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Provides
a library of container classes to “hold your objects”
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2 types
of Containers:
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Collection: to hold a group of elements e.g., List, Set
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Map: a group of key-value object pairs. It helps to return
“Set
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of
keys, collection of values, set of pairs. Also works with
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multiple
dimensions (i.e., map of maps).
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Iterators give you a better handle on containers and helps
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to
iterate through all the elements. It can be used without
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any
knowledge of how the collection is implemented.
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Collections API provides a few general purpose algorithms
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that
operate on all containers.
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