Overriding a method in an instantiated Java object

Question

I would like to override a method in an object that\'s handed to me by a factory that I have little control over.

My specific problem is that I want to override the

Answer 1

Since Java uses class-based OO, this is impossible. What you can do is use the decorator pattern, i.e. write a wrapper for the object that returns the wrapped streams.

Answer 2

two options:

1. easy : if Foo were you implemetn an interface you can use a Dynamic proxy to add new functionality.
2. more work: what you have is an "around" advice of AOP - you can use any of the existing AOP tools to make that possible. Spring Framework can do it for you, if you are using it already.

Answer 3

I'm not sure if this is possible. Have you considered creating your own class, having the object returned by the factory as a member, and then writing the doBar() method for that class.