title: How to obtain from a Map<Key,List<Value>> a List<Value>
body: <p>What is the best way to obtain from a Map a new List with all map values??</p>
  
  <p>Is this correct?</p>
  
  <pre><code>List&lt;Value&gt; listValues = new ArrayList&lt;&gt;();
  for(TypeKey keys : map.keySet()){
   for(TypeValue values : map.get(keys)){
    listValues.add(values);
   }
  }
  </code></pre>