Is it possible to create an anonymous class while using reflection?

Question

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 initia

Answer 1

It sounds like what you want are Dynamic Proxies, which have been available since Java 1.3.

Edit: I looked into mockito to see how they managed to mock concrete classes and it turns out they create byte code and then load it with a class loader. Not only does that not really get what you want, but it is more complex than it necessary.

I agree with Stephen C: Why do you want to do this? I suspect there may be an easier way. I suspect what may work better for you is the Strategy or Command pattern. In that case, the custom code is in its own little class:

public class Initializer {

  public (abstract) void initialize(A parent);
}

final String args[] = ...;
Initializer initializer = new Initializer() {
  public void initialize(A parent) {
      parent.setMessage(args);
  }
};

which is either assigned to the main class or wraps the main class (depending on the need).