Video about Java hashmap with arrayList as values
<p>I saw a video a couple of days ago but don't remember where. The speaker constructs a hashmap where he stores the course name as key and grades as values. Then he iterates and constructs complex data structures using hashmap.</p>

<p>Does anyone know where this or a similar video is available? Most videos on hashmap that I saw are simple, with keys as strings and simple data types as values.</p>
