title: How to hard define in code a matrix Integer[][]
body: <p>Question is simple for an expert</p>
  
  <pre><code>Integer[][] res= new Integer[][] {.....hard code some values here on 2 dim...}
  </code></pre>
  
  <p>How to return here 2 rows and 3 cols like this</p>
  
  <pre><code>1 2 3
  4 5 6
  </code></pre>