How to create a HashSet in Java?

HashSet extends AbstractSet and implements the Set interface. It creates a collection that uses a hash table for storage.

The following is an example to create a HashSet.

Declare a HashSet object

HashSet hs = new HashSet();

Now, add some elements

hs.add("B");
hs.add("A");
hs.add("D");
hs.add("E");
hs.add("C");
hs.add("F");
hs.add("K");

Now display the HashSet elements as shown below

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String args[]) {
      // create a hash set
      HashSet hs = new HashSet();
      // add elements to the hash set
      hs.add("B");
      hs.add("A");
      hs.add("D");
      hs.add("E");
      hs.add("C");
      hs.add("F");
      hs.add("K");
      hs.add("M");
      hs.add("N");
      System.out.println(hs);
   } 
}

Output

[A, B, C, D, E, F, K, M, N]

Arjun Thakur

Updated on 30-Jul-2019 22:30:24

• Related Questions & Answers
• How to sort HashSet in Java
• HashSet in Java
• Traverse through a HashSet in Java
• Initialize HashSet in Java
• Initializing HashSet in Java
• The HashSet in Java
• How can we implement a Custom HashSet in Java?
• Convert array to HashSet in Java
• Add elements to HashSet in Java
• Convert HashSet to TreeSet in Java
• Create HashSet from another collection in C#
• Importance of HashSet in Java
• Convert elements in a HashSet to an array in Java
• Convert an ArrayList to HashSet in Java
• Remove all elements from a HashSet in Java