Check if a particular element exists in Java HashSet Example

This Java Example shows how to check whether an elements is contained in Java HashSet using contains method.

import java.util.HashSet;

public class CheckElementHashSetExample {

 public static void main(String[] args) {

  // create object of HashSet
  HashSet hSet = new HashSet();

  // add elements to HashSet object
  hSet.add(1);
  hSet.add(2);
  hSet.add(3);

  /**
   * To check whether a particular value exists in HashSet use boolean
   * contains(Object value) method of HashSet class. It returns true if
   * the HashSet contains the value, otherwise false.
   **/

  boolean blnExists = hSet.contains(3);
  System.out.println("3 exists in HashSet ? : " + blnExists);

 }
}

The output is:


3 exists in HashSet ? : true