Pet.java- An abstract class to represent the concept of a pet. A pet should have a name, a gender and a sound (choose appropriate data-types for these). Dog.java - an implementation of the pet concept. A dog should have a "woof" sound, and it should have a Bone (see Bone.java description below). Cat.java - an implementation of the pet concept. A cat should have a "meoh" sound, and it should have a Fish (see Fish.java description below). Bone.java - should be a minimal class which composes a String "$==$" which is its printString (further, a toString() method should be implemented that returns the printString. Fish.java - similar to Bone.java only the printString is "}==*->"

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