Given the parent abstract class Animal, create child classes Dog, Cat and Pig that implement the methods defined in the abstract class. In addition, create a constructor that takes a string parameter that represents the sound the animal makes and a toString method to provide a string representation of the object in each of the child classes. Your program should run with this diver without modification.

Animal Class:

public abstract class Animal {

public String sound;

public abstract void setSound(String sound);

public abstract String getSound();

}

AnimalDriver:

public class AnimalDriver {

public static void main(String[] args) {

Dog dog = new Dog("woof");

Cat cat = new Cat("meow");

Pig pig = new Pig("oink");

System.out.println(dog);

System.out.println(cat);

System.out.println(pig);

}

}