Linked Hashset in java

What is Linked Hashset in java?

Linked HashSet::

--> It is child class of Hashset.

--> It is exactly same as hashset(including constructors and methods) but insertion order is preserved.

--> Duplicates are not allowed.

--> It's structure is combination of linkedlist and hashtable.

Demo program on Linked HashSet:

import java.util.LinkedHashSet;

public class setDemo {
    public static void main(String[] args) {
        LinkedHashSet hs = new LinkedHashSet();
        hs.add(1);
        hs.add("1");
        hs.add(null);
        hs.add(3);
        System.out.println(hs.add(3));
        System.out.println(hs);
    }
}

Output:

If we execute above program will get constant output as insertion order is preserved in LinkedHashSet.
In general we can use linked hashset to develop cache based applications where duplicated are not allowed and insertion order preserved.

Please comment below to feedback or ask questions.