title: Convert List of Array into single Array
body: <p>How to convert List of arrays into a single array in Java. Is there any predefined function to use?</p>
  
  <p>Below is the list of arrays, I want to iterate and keep all values in a single array. </p>
  
  <pre><code>List&lt;Integer[]&gt; integerArrayList = new ArrayList&lt;Integer[]&gt;();
  
  Integer[] resultArray = {};
  </code></pre>
  
  <p>Is there efficient way to implement? </p>