title: What are the java collections accepts adding null values?
body: <p>I know Set and Map accepts null values and today I just found out LinkedList also accepts null values like</p>
  <pre><code>   map.put(null, 1);
     set.add(null);
     linkedList.add(null)
  </code></pre>
  <p>Is there any other collections that allow null values to be stored?. Just posting to get a comprehensive list in one place and reason for each for them.</p>