Multiple Observer and Multiple Observable

I'm using the Observable class/Observer interface in JAVA to implement the observer pattern. If I have an object that I want to be able to observe several other observable object (multiple observables) and have several observer (multiple observer) The problem is not anObservable in class B , But I want to value in A and B for generate chart public void update(Observable anObservable, Object anObject) { if(anObservable instanceof A){ createDataSet(anObservable,null); } else if(anObservable instanceof B) { createDataSet(null,anObservable); } } private void (Observable anSampleObservable,Observable anAreaObservable){ // To do something with value in anSampleObservable (A) and value in anAreaObservable(B)} Any advice? Thanks.

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