enumにデフォルト実装をもたせられるか

A.java

interface Animal {
  default void say() {
    System.out.println("I'm Animal");
  }
}

enum Bird implements Animal {
  Sparrow,
  Pigeon
}

public class A {
  public static void main(String... args) {
    Bird.Sparrow.say();
  }
}

gistfile1.txt

% /usr/libexec/java_home -v 1.8 -exec javac A.java
% /usr/libexec/java_home -v 1.8 -exec java A
I'm Animal