title: How to merge 2D arrays in java?
body: <p>So I want to merge two 2D Arrays in java, for example:  </p>
  
  <pre><code>arr1 = {{id, first_name, last_name}, {1, denise, phillips}}  
  arr2 = {{gender, ip_address}, {Female, 152.81.244.149}}  
  </code></pre>
  
  <p>it would join these and become:    </p>
  
  <pre><code>arr3 = {{id, first_name, last_name, gender, ip_address}, {1, denise, phillips,Female, 152.81.244.149}}
  </code></pre>