title: how to add value into List<Map<String, Object>>?
body: <p>I'm trying to add a value to an <code>ArrayList</code>.</p>
  
  <p>Here is the code I wrote:</p>
  
  <pre><code>List&lt;Map&lt;String, Object&gt;&gt; list = new ArrayList&lt;&gt;();
  list.put(1,"foo", (Object)"bar");
  </code></pre>
  
  <p>But, this does not work. Anybody have an idea?</p>