Class PerformingDogA

generics/DogsAndRobotMethodReferences.java:9–13

import java.util.function.*;

class PerformingDogA extends Dog {
  public void speak() { System.out.println("Woof!"); }
  public void sit() { System.out.println("Sitting"); }
  public void reproduce() {}
}

class RobotA {
  public void speak() { System.out.println("Click!"); }