Differentiate HashSet and LinkedHashSet

Differentiate HashSet and LinkedHashSet

FeatureHashSetLinkedHashSet
DefinitionHashSet is an implementation of the Set interface. It stores unique elements (no duplicates).LinkedHashSet is an ordered version of HashSet. It maintains the insertion order of elements.
DuplicatesHashSet does not allow duplicate elements.LinkedHashSet also does not allow duplicate elements.
OrderingHashSet does not maintain any specific order of elements.LinkedHashSet maintains the insertion order of elements.
Null ValuesHashSet allows a single null value.LinkedHashSet allows a single null value.
ImplementationHashSet uses a hash table for storage.LinkedHashSet uses a hash table and a doubly-linked list for storage.
Examplejava Set<String> names = new HashSet<>(); names.add(“Alice”); names.add(“Bob”); names.add(“Charlie”); System.out.println(names);java Set<String> names = new LinkedHashSet<>(); names.add(“Alice”); names.add(“Bob”); names.add(“Charlie”); System.out.println(names);

HashSet and LinkedHashSet

In the examples above, HashSet stores unique names, while LinkedHashSet maintains the insertion order of names. Remember that HashSet is ideal for maintaining a collection of unique elements, while LinkedHashSet is useful when order matters.

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