title: Is it possible to create an anonymous class while using reflection?
body: <p>I would like to be able to implement a method at runtime that is called before an object runs the initializers.  This will allow me to set fields that are used during initialization. </p>
  
  <p>Here is an example:</p>
  
  <pre><code>class A {
    public A() {
      initialize();
    }
    public void initialize() { }
  }
  
  class B extends A {
    public String message;
    {
      System.out.println(message);
    }
  }
  
  public class MainClass {
    public static void main(final String[] args) throws Exception {
  
      Class&lt;A&gt; aClass = (Class&lt;A&gt;)Class.forName(args[0]);
      // what's next in order to something like this even though
      // I don't know what subclass of A was passed in as an
      // argument above 
      A a = aClass.newInstance()
      {
        public void initialize() {
          this.message = args[1];
        }
      };
    }
  }
  </code></pre>
  
  <p>I will probably end up using aspects, but I would like to know if there is a pure Java way.</p>