“Sets” of a particular enum type but with generics

Question

Let\'s say I have an abstract class

public abstract class Trainer{}

I have specific trainers like :

pub         


        

Answer 1

Despite design analysis, I think the most your-situation (closest to your already created design) answer is:

• your DogTrainer.Trainables is TrainingActions
• your HorseTrainer.Trainables is TrainingActions

Generally, your Trainables is already a TrainingActions

so you can just provide Set> completed, because you already have your animal information in T:

abstract class Trainer {
    Set> completed = new HashSet>();

    public void add(TrainingActions t ) {
        completed.add( t );
    }
}

And you have exactly what you want.

Usage:

DogTrainer tr = new DogTrainer();
tr.add( DogTrainer.Trainables.BITE );

If you are sure you want to enforce an Enum for your interface:

public  & TrainingActions> void add( E t ) {
   completed.add( t );
}