Java LinkedHashSet class extends HashSet and implements Set interface. Java LinkedHashSet Class Methods with Examples public class LinkedHashSet extends HashSet implements Set , Cloneable, Serializable. The underlying data structure is the combination of HashTable and LinkedList, hence it is termed as LinkedHashSet then it doesn’t allow the duplicates, and it … LinkedHashSet allows you to quickly check for the existence of an entry, just like HashSet, but contains an ordered list inside. If the LinkedHashSet contains large number of elements, it may not perform well. Plus, you need to convert to array every time there is a change in the set object. Use this only if the set is not changed much and you need to access large number of elements using the index. LinkedHashSet]:1,2,3,4,5,10 List[java.util. Its because Collection is a super interface of List.. Java Collection framework provides many interfaces (Set, List, Queue, Deque) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet). When compared with C++, Java codes are generally more maintainable because Java does not allow many things which may lead to bad/inefficient programming if used incorrectly. Null elements are allowed, and all the optional Set operations are supported. ; reverse-order of insertion-order. LinkedHashSet is a variant of HashSet. Introduction to Java LinkedHashSet With Examples This class extends HashSet, but adds no members of its own. 所有集合类都位于java.util包下，集合只用于存储对象，集合长度是可变的，集合可以存储不同类型的对象。集合框架体系图Java的集合类主要由两个接口派生而出：Collection和Map，Collection和Map是Java集合框架的根接口，这两个接口又包含了一些子接口或实现类。 The LinkedHashSet class provides methods that allow us to perform various operations on the linked hash set. To access the elements of a linked hash set, we can use the iterator () method. In order to use this method, we must import the java.util.Iterator package.