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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 LinkedHashSet example

This is an example of how to check for an element existence in a LinkedHashSet. We will use the contains(Object o) API method of LinkedHashSet. Checking if an element exists in a LinkedHashSet implies that you should:

  • Create a new LinkedHashSet.
  • Populate the set with elements, using the add(E e) API method of LinkedHashSet.
  • Check if a specific element exists in the set, using contains(Object o) API method, having the element as parameter. The method returns true if the set contains the specified element.

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

package com.javacodegeeks.snippets.core;
 
import java.util.LinkedHashSet;
 
public class ElementExistsLinkedHashSet {
 
  public static void main(String[] args) {
 
    // Create a LinkedHashSet and populate it with elements
    LinkedHashSet linkedHashSet = new LinkedHashSet();
    linkedHashSet.add("element_1");
    linkedHashSet.add("element_2");
    linkedHashSet.add("element_3");

    // boolean contains(Object value) method returns true if the LinkedHashSet contains the value, otherwise false.
    boolean exists = linkedHashSet.contains("element_2");
    System.out.println("element_2 exists in LinkedHashSet ? : " + exists);
 
  }
}

Output:

element_2 exists in LinkedHashSet ? : true

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

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