Change a field type and method call

Hi, 

How can I change a field type and method call?

For example:
public class A {
  public void a_method() { ... }
}

public class B extends A {
  public static void a_static_method() { 
    ...
    a_method();
    ...
  }
}

public class C {
  public A instance_of_A;

  public void method() {
    instance_of_A.a_method();
  }
}

I want to change in class C the type of instance_of_A to B and change the call
instance_of_A.a_method() to B.a_static_method()

How can i do this.

-- 
You receive this message as a subscriber of the [email protected] mailing list.
To unsubscribe: mailto:[email protected]
For general help: mailto:[email protected]?subject=help
OW2 mailing lists service home page: http://www.ow2.org/wws