title: How to find array ID?
body: <p>How to find array ID ?</p>
  
  <p>for example:</p>
  
  <pre><code>String[] ar = {"ABC","EFG","HIJ"};
  </code></pre>
  
  <p>When search string will be "A" and it will show ABC but how to understand what Place in array has ABC 
  (<code>ar[n]</code>, how to find ABC n ?)</p>