Pets-Java

• Objective: To implement a PetsOwner which manipulates composite Pet objects.
• Description Pets are Animals that can be either Dog or Cat. An Owner can have multiple Pets.

Pet

• Ensure each of the test cases in the class Pet successfully passes upon completion of each of the method stubs in the class PetTest.
  • Constructors
    • Pet()
    • Pet(String)
    • Pet(int)
    • Pet(String, int)
  • String getName()
  • Integer getAge()
  • void setOwner(PetOwner owner)
  • PetOwner getOwner()

Step 1 - Define instance variables

• To create a programmatic representation of a Pet, begin by declaring an instance variable for each of the following properties:
  • String name
    • a collection of characters, representative of a name.
  • Integer age
    • an integer, representative of an age in years.
  • PetOwner owner
    • the owner of this Pet.

Step 2 - Define the constructors

• Define a Pet constructor whose parameters are used to initialize its instance variables.
• A Pet can be constructed in 4 ways.
  1. Pet()
     • Upon nullary construction, pet has age of 0 and name of "".
  2. Pet(String)
     • Upon construction, name field should be set to respective parameter value, pet has default age of 0.
  3. Pet(int)
     • Upon construction, age field should be set to respective parameter value, pet has default name of "".
  4. Pet(String, int)
     • name and age variables should set to respective parameter values.

Step 3 - Define getter and setter methods

• Understand that instance variables are not directly exposed outside of the class. We use getter and setter methods to retrieve and assign values, respectively, to gatekeep their contents.
• Define a getter and setter for each of the instance variables declared in the Pet class.
  • String getName()
  • Integer getAge()
  • void setOwner()
  • PetOwner getOwner()

Cats and Dogs

• Understand that Pet is the parent class. Cat and Dog inherit from Pet, and implement the Animal interface.
• Cat
  • Ensure the class Cat supports all methods of Pet construction, successfully completing each of the method stubs in the class CatTest.
  • The mechanism by which a Cat speaks is by meowing; ensure a cat's speak method returns meow as a string.
• Dog
  • Ensure the class Dog supports all methods of Pet construction, successfully completing each of the method stubs in the class DogTest.
  • The mechanism by which a Dog speaks is by barking; ensure a dog's speak method returns bark as a string.

Part 5 - PetOwner

• Ensure each of the test cases in the class PetOwner successfully passes upon completion of each of the method stubs in the class PetOwner.

  • PetOwner(String name, Pet... pets)
  • void addPet(Pet pet)
  • void removePet(Pet pet)
  • Boolean isOwnerOf(Pet pet)
  • Integer getYoungestPetAge()
  • Integer getOldestPetAge()
  • Double getAveragePetAge()
  • Integer getNumberOfPets()
  • String getName()
  • Pet[] getPets()