title: Generation of abstract class with JCodeModel
body: <p>I'm trying to generate top-level abstract class with <a href="https://codemodel.java.net/" rel="nofollow noreferrer">JCodeModel</a> library, but I can't find any way to change class modifiers. <br/>
  It's possible for nested classes (JDefinedClass API provides methods that get modifiers as parameters). But for creation of top level classes I found only JCodeModel API methods that get fully qualified name with or without ClassType (class/interface/annotation/enum) as parameters.</p>
  
  <p>Does anybody can suggest me how to change modifiers of JDefinedClass to make it abstract? </p>