Implement the Speaker interface and create 3 classes(Dog, Cat, Philosopher) that implement Speaker in various ways (in addition to overriding methods, each class should add an additional method).

public interface Speaker

{

public void speak();

public void announce(String str);

}

Create a driver class - TestSpeaker.java - whose main method instantiates each of the 3 classes and tests their abilities using the same Speaker reference. Then try to execute all methods from each class (using different reference types).