title: Adding a single row at the end of `ArrayList`
body: <p>folks, how can I add an additional row to the end of the  <code>2D ArrayList</code>? What is the technique for that? Or how should I approach it? I haven't written a code for that because I don't how to start it. </p>
  
  <p>I have a <code>2D ArrayList</code> which is</p>
  
  <p><code>ArrayList&lt;ArrayList&lt;T&gt;&gt; myBoard = new ArrayList&lt;ArrayList&lt;T&gt;&gt;();</code>
  and would like to add an additional line to its end but do not know how to approach it. My <code>2D ArrayList</code> looks like the following:</p>
  
  <pre><code>The number of rows is 6
  The number of cols is 3
  ABC
  AAA
  BAC
  BEC
  BEA
  BAB
  </code></pre>
  
  <p>Could please smb help me?</p>
  
  <pre><code>public void addRowBottom(ArrayList&lt;ArrayList&lt;T&gt;&gt; myBoard){
        ArrayList&lt;T&gt; addRow = new ArrayList&lt;T&gt;();
  
  }
  </code></pre>