Java forcing interface on 3rd party class through anonymous class

Question

I've got some 3rd party beans that have method signatures that fit quite well onto an existing interface but it does not implement the interface.

Now I would like to do something like this, which doesn't work. Is there some workaround?

 someBean.setSomeInterface(
         new Interface() extends SomeBeanThatMatchesAlotOfMethodsOfTheInterface {
     });

How about the Adapter pattern? http://en.wikipedia.org/wiki/Adapter_pattern — ftr, Mar 23 '12 at 16:19

score 2 · Answer 1 · answered Mar 23 '12 at 16:19

I think about all you could do is extend their class (like you did above) and then say implements.

Eg.

public class MyImplementingClass extends SomeBeanThatMatchesAlotOfMethodsOfTheInterface implements MyInterface {

....
}

Of course by basing their code on your interface it is possible that it could break in the future. Just be aware of that.

score 2 · Accepted Answer · answered Mar 23 '12 at 16:34

2

You can use a decorator pattern for this

Define a class that implements your interface and in all the method calls delegate to the someBean implementation.

answered Mar 23 '12 at 16:34

Cratylus

2 Answers2