1:  interface Nocturnal {
2:    default boolean isBlind() {return true;}
3:  }
4:  public class Owl implements Nocturnal {
5:    public boolean isBlind() {return false;}
6:      public static void main(String[] args){
7:      Nocturnal nocturnal = (Nocturnal) new Owl();
8:      System.out.println(nocturnal.isBlind());
9:      }
10:  }