Add Elements to an ArrayList within a HashMap : <p>How to add an Element to an ArrayList within a HashMap?</p>

<p>This is a question, that I have asked myself many times and forgot it after solving it. I guess many have the same one so here is the simple answer to it.</p>

<pre><code>// Example
HashMap&lt;String, ArrayList&lt;String&gt;&gt; someElements = new HashMap&lt;String, ArrayList&lt;String&gt;&gt;();
</code></pre>
