title: Merge two string arrays to list of element pairs
body: <p>I have two arrays with different size:</p>
  
  <pre><code>added_items[1, 2, 3]
  deleted_items[3, 4]
  </code></pre>
  
  <p>My goal is to convert these arrays to list of the following pairs:</p>
  
  <pre><code>list {
      added: 1, deleted 3
      added: 2, deleted 4
      added: 3, deleted: null
  }
  </code></pre>
  
  <p>Would be good if your share the simplest way how I can achieve this using guava, apache libraries, etc to avoid too many custom logic with for each etc..</p>
  
  <p>I would really appreciate any answers.</p>