Check for element existence in HashSet example (original) (raw)

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.

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

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