public class RubberDuck extends java.lang.Object implements Quackable
RubberDuck()
void
quack()
java.lang.String
toString()
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
public RubberDuck()
public void quack()
quack
Quackable
public java.lang.String toString()
toString
java.lang.Object