Java inheriting from two classes

I'm using an interface in java, that communicates with PureData. In order to do so, my classes have to extend a given class MaxObject. While designing my class, which is a cirular buffer, I discovered that I need to extend java's Iterator class. So I have to extend two classes at the same time.

My guess is that the only solution is to create two different classes and let one of them be a component of the other one. But, is it the only solution? Is it the best one?

Further, whenever I find myself needing inherit from two classes, is it a because of a bad design? 开发者_如何学PythonIs there a design pattern to solve this class?

Thank you

Iterator is not a class, it's an interface. As such, you don't extend it, you implement it. You can implement any number of interfaces - the only limitation is that you can only extend one class.

In your case:

class MyClass extends MaxObject implements Iterator<Type>

edit: I should have read closer what's being extended. EboMike is right, you don't need to extend the Iterator class.

Sounds like the DDofD: http://javacodeonline.blogspot.com/2009/08/deadly-diamond-of-death.html

Iterator is an interface. From a theoretical point of view there's nothing against extending MaxObject and implementing Iterator.

Due to a lack of information I cannot say if it's a good idea to do this, but I have a bad feeling.