Design a class that represents a dog. This class should have fields that represent the breed, the weight, the sex and the birthdate (design a class of Date with integer fields for month, day and year). Include a constructor method with formal parameters for all of the fields, a toString method that prints all the instance variables (one per line with a simple heading, like -> Breed: German Shepherd), and an equals method to determine if one dog object is equal to another (all the instance variables of each Dog object must match to be equal make sure you have included an equals method for Date).

Derive a PetDog class from the Dog class. This class should have String fields for owner and address, a parameterized constructor, a toString method and an equals method (PetDog objects must also have all the Dog variables equal and the same owner to be equal to each other.) These two methods will override the similarly named methods in the Dog class and can make use of the parent class methods.

Write a test class that demonstrates each of your methods.