title: Java Check if two lists are mutually exclusive
body: <p>Ok, I have <em>List a</em> and <em>List b</em></p>
  
  <p>is there a way to check that no value exist between the two?</p>
  
  <pre><code>List a // 1,2,4,5
  List B // 1,6,7,8
  </code></pre>
  
  <p>Between both list <code>// 1    FAILURE</code></p>