title: How to assert if KeyPressEvent was any keyboard character?
body: <p>I want to assert a <code>com.google.gwt.event.dom.client.KeyPressEvent</code>. It should match any characters or digits, and signs like ,.-+~ etc.
  Especially I want to exclude all "navigation" keys like arrows, insert, delete, pos1, end, F1-12 etc.</p>
  
  <p>Why does the following not work?</p>
  
  <pre><code>KeyPressEvent keyEvent;
  if (Character.isLetterOrDigit((int) keyEvent.getUnicodeCharCode()) {}
  </code></pre>
  
  <p>Result:</p>
  
  <blockquote>
    <p>The method isLetterOrDigit(char) in the type Character is not applicable for the arguments (int)</p>
  </blockquote>