Java – can I implement multiple callback interfaces in C?

Can I implement multiple callback interfaces in C for Java?

Solution

The answer is No You can only implement a callback interface in C, and there are some good reasons The callback mechanism depends on the fact that there is a Java type that implements the callback interface This Java type has all the knowledge to delegate callback calls to C objects maintained internally as pointers

If you implement multiple callback interfaces in C, you will aggregate multiple Java implementation types in C Each type only knows how to handle its own callback methods, but does not know how to handle callback methods of other aggregate types