title: Change value of multidimensional ArrayList
body: <p>I need a solution to change the value of an element in a multidimensional ArrayList in Java. This is my ArrayList:
      public class Users {</p>
  
  <pre><code>ArrayList&lt;ValidateUser&gt; personer = new ArrayList&lt;ValidateUser&gt;();
  
  public Users() {
    personer.add(new ValidateUser("admin", "asdf123", 0.8, "admin"));
    personer.add(new ValidateUser("jesper", "ukamm19", 2.5, "user"));
    personer.add(new ValidateUser("lars", "lol123", 1.5, "user"));
  }
  </code></pre>
  
  <p>I want to change the double value (0.8) at the user "admin", for example.
  This would be done from another a class.
  How to do so?</p>
  
  <p>Thanks in advance! :) </p>