HashMap Iterator example

In this example we shall show you how to use a HashMap Iterator. To use a HashMap one should perform the following steps:

  • Create a new HashMap.
  • Populate the hashMap with elements, with the put(K key, V value) API method of HashMap.
  • Invoke the entrySet() API method of the HashMap to get a Set of all the entries (key – value pairs) contained in the HashMap.
  • Obtain an Iterator for the entries Set, and iterate through the HashMap entries,

as described in the code snippet below.

package com.javacodegeeks.snippets.core;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
public class HashMapIterator {
  public static void main(String[] args) {
    // Create a HashMap and populate it with elements
    HashMap hashMap = new HashMap();
    // Get a set of all the entries (key - value pairs) contained in the HashMap
    Set entrySet = hashMap.entrySet();
    // Obtain an Iterator for the entries Set
    Iterator it = entrySet.iterator();
    // Iterate through HashMap entries
    System.out.println("HashMap entries : ");



HashMap entries : 

This was an example of how to use a HashMap Iterator in Java.

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.
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