title: Should check the method return value
body: <p>Why in this case I get a message "Should check the method return value"?</p>
  
  <pre><code>if(!qty.contains("@"))
        mgm.addOrder(date, Integer.parseInt(qty));
  else
  {
        qty.replace("@", "");
        mgm.addOrder(date, Integer.parseInt(qty));
        mgm.startNew();
  }
  </code></pre>
  
  <p>I get this message at: qty.replace("@", "");</p>
  
  <p>The if statement has checked if @ is there, what else do I need to make it perfect? </p>