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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? Is there a design pattern to solve this class?

Thank you

Solution

  • 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>