Sets are collections that allow only one object with a given value in them.
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Sets are collections that allow only one object with a given value in them. The java.util.Set interface is a subinterface of Collection. There are two very useful concrete classes that implements sets:
java.util.HashSet is implemented with a hash table. Access time is O(1). Entries are unsorted.
java.util.TreeSet is implemented as a balanced binary tree. Access time is O(log N). Entries are sorted.
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