In Java, LinkedHashSet
is available in java.util
package and it is the child class of HashSet
. with LinkedHashSet
we can maintain the order of elements which is not possible with HashSet
. This ordering in LinkedHashSet
is achieved by using a doubly linked list.
![LinkedHashSet in Java](https://thecodedata.com/wp-content/uploads/2023/09/Copy-of-neo4j-database-1024x576.jpg)
LinkedHashSet
is the same as HashSet (including constructors and methods) except for the following references. For a detailed explanation of the Constructors and methods of HashSet
check this tutorial – HashSet in Java: Complete Tutorial
HashSet | LinkedHashSet |
---|---|
1. The underlying Data structure for LinkedHashSet is a combination of HashTable and LinkedList. | 1. The underlying Data structure for LinkedHashSet combines HashTable and LinkedList. |
2. In HashSet insertion order is not preserved | 1. The underlying Data structure for HashSet is HashTable |
3. Introduced in Java 1.2v | 3. Introduced in Java 1.4v |
LinkedHashSet Java Example
import java.util.LinkedHashSet;
public class LinkedHashSetDemo {
public static void main(String[] args) {
LinkedHashSet<String> linkedHashSet = new LinkedHashSet<>();
linkedHashSet.add("The"); //Insertion
linkedHashSet.add("Code"); //Insertion
linkedHashSet.add("Data"); //Insertion
linkedHashSet.add("Java"); //Insertion
linkedHashSet.remove("Java"); //Deletion or removing element
//Retrival of elements
for(String element : linkedHashSet){
System.out.println(element);
}
}
}
![LinkedHashSet Java Example](https://thecodedata.com/wp-content/uploads/2023/09/image-4.png)
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