HashSet and LinkedHashSet

HashSet (Since Java 1.2):  HashSet is achild interface of Set.  Underlying data structure is HashTable.(Internally it’s a HashMap. See HashTable code)  Insertion order is not preserved.  Duplicates are not allowed.  Allows null element ( only one since set will not allow duplicates).  Default initial capacity is 16.  Default load factor is 0.75f.  Threshold = capacity […]