How can I eliminate duplicated Enum code?

Question

I have a large number of Enums that implement this interface:

/**
 * Interface for an enumeration, each element of which can be uniquely identified by its co         


        

Answer 1

In my opinion, this would be the easiest way, without reflection and without adding any extra wrapper to your enum.

You create an interface that your enum implements:

public interface EnumWithId {

    public int getId();

}

Then in a helper class you just create a method like this one:

public  T getById(Class enumClass, int id) {
    T[] values = enumClass.getEnumConstants();
    if (values != null) {
        for (T enumConst : values) {
            if (enumConst.getId() == id) {
                return enumConst;
            }
        }
    }

    return null;
}

This method could be then used like this:

MyUtil.getInstance().getById(MyEnum.class, myEnumId);