Java Interface implementation problem

Question

I have problem with sets. Required java.lang.String found String... What can i do there?

public interface Node {
        public <V> V get();
        public <V> void sets(V value);
    }

public enum MIBNodes implements Node {

    TEST {
         private String e;
        @Override
        public String get() {
            return "aa";
        }

        @Override
        public <String> void sets(String value) {
           e=value;
        }




    };


};

UPDATE
Each enum instance like TEST , TEST1 ... may have different type.. String, Integer or anyother... So public enum MIBNodes implements Node { cant become public enum MIBNodes implements Node<String> {

Sean Patrick Floyd · Accepted Answer · 2011-05-25 10:20:16Z

4

This is the Problem:

@Override
public <String> void sets(String value) {
        ^^^^^^
    e=value;
}

Here, String is a type variable (a re-definition of V), not a java.lang.String. And I don't really think you can fix that without changing your design:

public interface Node<V> {
    public V get();
    public void sets(V value);
}

And in case you want your enum to be generic : that's impossible. Different enum items can't implement the same interface with different generic parameters.

answered May 25, 2011 at 10:20

Sean Patrick Floyd

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3 Comments

GorillaApe Over a year ago

So any alternative solution to this?

Sean Patrick Floyd Over a year ago

@Parhs One enum per Generic Type, I'm afraid

Sean Patrick Floyd Over a year ago

Of course it works for get: you can always return a more specific type (and document that in the method signature). But you can't take a more specific parameter than the super class or interface

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