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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

Check for element existence in HashSet example

This is an example of how to check for an element existence in a HashSet. Checking if an element exists in a HashSet implies that you should:

  • Create a new HashSet.
  • Populate the hashSet with elements, using add(E e) API method of HashSet.
  • Invoke contains(Object value) API method of HashSet, with a specified element as parameter. The method returns true if the element exists in the hashSet and false otherwise.

Let’s take a look at the code snippet that follows:
 

package com.javacodegeeks.snippets.core;
 
import java.util.HashSet;
 
public class ElementExistsHashSet {
 
  public static void main(String[] args) {
 
    // Create a HashSet and populate it with elements
    HashSet hashSet = new HashSet();
    hashSet.add("element_1");
    hashSet.add("element_2");
    hashSet.add("element_3");
 
    // boolean contains(Object value) method returns true if the HashSet contains the value, otherwise false.
    boolean exists = hashSet.contains("element_2");
    System.out.println("element_2 exists in HashSet ? : " + exists);
 
  }
}

Output:

element_2 exists in HashSet ? : true

 
This was an example of how to check for an element existence in a HashSet in Java.

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