Respuesta :
Set will use to collect all of the letters from a long string without storing duplicates
Explain set in collections?
A Collection that excludes duplicate elements is referred to as a Set. HashSet, Tree-Set, and LinkedHashSet are the three general-purpose Set implementations. The best-performing approach is a hash set, which does not guarantee the order of iterations but saves its components in a hash table. Tree-Set is significantly slower than HashSet and stores its items in a red-black tree in the order of their values. The implementation of LinkedHashSet as a hash table with a linked list via it arranges its members according to the order in which they were added to the set (insertion-order). For a marginally higher price, LinkedHashSet protects its clients from the vague, generally chaotic ordering offered by HashSet.
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