title: How to get an Integer from a String (contains letters and number)?
body: <p>Here is an example of what I'm trying to do:</p>
  
  <pre><code>String letternumber = "Example - 123";
  </code></pre>
  
  <p>I want to output <code>"123"</code> but I need to get it from the string, I can't just do:</p>
  
  <pre><code>String number = "123";
  System.out.println(Integer.parseInt(number));
  </code></pre>
  
  <p>Or I will get an error.</p>