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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

HashSet Iterator example

This is an example of how to obtain a HashSet Iterator, that is an iterator over the elements of the HashSet. Obtaining a HashSet Iterator implies that you should:

  • Create a new HashSet.
  • Populate the hashSet with elements, using add(E e) API method of HashSet.
  • Invoke iterator() API method of HashSet. The method returns the Iterator over the elements in this hashSet.
  • Iterate over the elements of the HashSet, using hasNext() and next() API method of Iterator.

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

package com.javacodegeeks.snippets.core;
 
import java.util.HashSet;
import java.util.Iterator;
 
public class HashSetIteratorExample {
 
  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");
 
    // To get the Iterator use the iterator() operation
    Iterator it = hashSet.iterator();
 
    System.out.println("Elements in HashSet :");
    while(it.hasNext())

System.out.println(it.next());
  }
}

Output:

Elements in HashSet :
element_1
element_2
element_3

 
This was an example of how to obtain a HashSet Iterator in Java.

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