Multiset - Algoritmy.net
Multiset (bag) is a generalized version set structure. Analogously to set, multiset is a container used for storing values and it does not guarantee any particular ordering of its contents. On the other hand, it allows storing of multiple items with the same value (ie. supports non-unique keys).
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Multiset (bag) is a generalized version set structure. Analogously to set, multiset is a container used for storing values and it does not guarantee any particular ordering of its contents. On the other hand, it allows storing of multiple items with the same value (ie. supports non-unique keys).
Check com.google.common.collect.AbstractMapBasedMultiset
Read full article from Multiset - Algoritmy.net