title: (Groovy) Add multiple values to an ArrayList
body: <p>like the title says, I want to add multiple values to my arrayList in Groovy.
  But it is not accepted.</p>
  <pre><code>Collection&lt;String&gt; actorCollection = new ArrayList&lt;&gt;();
  actorCollection.add(&quot;first&quot;,&quot;second&quot;);
  </code></pre>
  <p>If there is only a single value, it works perfectly.</p>
  <p>Thanks in advance!</p>