Java multiple inheritance using two interface having same method but different parameters

Question

When I tried to do Controller so, I`ve got a message: Listener cannot be inherited with different arguments AlfaMsg and GammaMsg. I read some patterns, but it does not help me. How I can realize this idea?

public abstract class Msg {

}   

public class AlfaMsg extends Msg{


}

public class GammaMsg extends Msg{


}

public interface Listener<T extends Msg> {
   void update(String message, T msg);    
}

public interface ListenerAlfa  extends Listener<AlfaMsg> {
   @Override    
   void update(String message, AlfaMsg deviceMessage);    
}

public interface ListenerGamma  extends Listener<GammaMsg> {
   @Override    
   void update(String message, GammaMsg deviceMessage);    
}

public class Controller implements ListenerAlfa, ListenerGamma{

    @Override
    void update(String message, AlfaMsg deviceMessage){

    }

    @Override
    void update(String message, GammaMsg deviceMessage){

    }
}

Nowhere Man · Accepted Answer · 2020-04-29 08:00:15Z

1

Unfortunately, you cannot do this using generics, because of type erasure - so that Controller would be implementing the same Listener interface twice.

You may want to review a previous answer to similar question, it has some workaround using encapsulation, but I am not sure this is what you'd like to implement.

answered Apr 29, 2020 at 8:00

Nowhere Man

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