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> {

Answer 1

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.

• GorillaApe: So any alternative solution to this?
• Sean Patrick Floyd: @Parhs One enum per Generic Type, I'm afraid
• Sean Patrick Floyd: 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