Differentiate LinkedHashSet and TreeSet
Feature | LinkedHashSet | TreeSet |
Definition | LinkedHashSet is an ordered collection that maintains the insertion order of elements. It combines a hash table with a doubly linked list. | TreeSet is an ordered collection that maintains its elements in sorted order (natural order or custom comparator). |
Duplicates | LinkedHashSet does not allow duplicate elements. | TreeSet also does not allow duplicate elements. |
Ordering | LinkedHashSet maintains the insertion order of elements. | TreeSet orders the elements according to a specified order (natural or custom). |
Null Values | LinkedHashSet allows a single null value. | TreeSet does not permit null values. If you insert null, it will throw a NullPointerException. |
Implementation | LinkedHashSet uses a hash table and a doubly linked list for storage. | TreeSet uses a balanced binary search tree (usually a red-black tree) for storage. |
Example | java Set<String> names = new LinkedHashSet<>(); names.add(“Alice”); names.add(“Bob”); names.add(“Charlie”); System.out.println(names); | java Set<String> names = new TreeSet<>(); names.add(“Alice”); names.add(“Bob”); names.add(“Charlie”); System.out.println(names); |
Table of Contents
In the examples above, LinkedHashSet maintains the insertion order of names, while TreeSet orders the names alphabetically. Remember that LinkedHashSet is ideal when you need to maintain insertion order, while TreeSet is useful when you want sorted elements