Create HashSet in Java - How to add Elements to HashSet

Last updated Apr 04, 2022

To create a HashSet, you first need to import the Java.util.HashSet package. After importing this package, you can now create the Java HashSet using the following syntax:

HashSet HashSet = new HashSet<>();

The HashSet Methods

We operate on a HashSet using the following methods:

add()- adds the specified set elements
addAll()- adds all the elements of the specified set collection
iterator()- enables accessing of the Set elements
remove()- The specified elements are removed from the HashSet
removeAll()- Removes all elements from the set
addAll()- Performs union between two sets.

How to Add Elements to HashSet

import java.util.HashSet;

public class HashSetExamples {

public static void main(String[] args) {

HashSet HS = new HashSet<>();

// Using add() method

HS.add(8);

HS.add(9);

HS.add(10);

System.out.println("First HashSet: " + HS);

HashSet HS2 = new HashSet<>();

// Using addAll() method

HS2.addAll(HS);

HS2.add(11);

System.out.println("Second HashSet: " + HS2);

}

Output:

First HashSet : [8, 9, 10]

Second HashSet : [8, 9, 10, 11]

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