Finished

src/main/java/com/zipcodewilmington/assessment1/Animal.java

@@ -4,5 +4,7 @@
  * Created by leon on 2/16/18.
  */
 public interface Animal {
+
+    // Returns the name of this animal
     String speak();
 }

src/main/java/com/zipcodewilmington/assessment1/Cat.java

@@ -10,19 +10,28 @@ public class Cat extends Pet {
      */
     public Cat(String name, Integer age) {
 
+        // Call the superclass constructor
+        super(name, age);
+
     }
 
     /**
      * @param age age of this Cat
      */
     public Cat(Integer age) {
+
+        // Call the superclass constructor
+        super(age);
     }
 
     /**
      * @param name name of this Cat
      */
     public Cat(String name) {
 
+        // Call the superclass constructor
+        super(name);
+
     }
 
     /**
@@ -32,12 +41,17 @@ public Cat(String name) {
      * age is 0
      */
     public Cat() {
+
+        // Call the superclass constructor
+        super();
     }
 
     /**
      * @return meow as a string
      */
     public String speak() {
-        return null;
+
+        // Return meow
+        return "meow";
     }
 }

src/main/java/com/zipcodewilmington/assessment1/Dog.java

@@ -10,19 +10,27 @@ public class Dog extends Pet {
      */
     public Dog(String name, Integer age) {
 
+        // Call the superclass constructor
+        super(name, age);
+
     }
 
     /**
      * @param age age of this dog
      */
     public Dog(Integer age) {
+
+        // Call the superclass constructor
+        super(age);
     }
 
     /**
      * @param name name of this dog
      */
     public Dog(String name) {
-
+
+        // Call the superclass constructor
+        super(name);
     }
 
     /**
@@ -32,12 +40,17 @@ public Dog(String name) {
      * age is 0
      */
     public Dog() {
+
+        // Call the superclass constructor
+        super();
     }
 
     /**
      * @return bark as a string
      */
     public String speak() {
-        return null;
+
+        // Return bark
+        return "bark";
     }
 }

src/main/java/com/zipcodewilmington/assessment1/Pet.java

@@ -8,54 +8,91 @@ public abstract class Pet implements Animal {
      * nullary constructor
      * by default, pet has age of 0; name of "";
      */
+
+    //define instance variables
+    //name, age, owner
+    private String name;
+    private Integer age;
+    private PetOwner owner;
+
+
     public Pet() {
+
+        //default age of 0 and name of ""
+        this("",0); 
     }
 
     /**
      * @param name name of this pet
      */
     public Pet(String name) {
+
+        //default age of 0
+        //specified name
+        this(name, 0);
     }
 
 
     /**
      * @param age age of this pet
      */
     public Pet(int age) {
+
+        //default name of ""
+        //specified age
+        this("", age);
     }
 
     /**
      * @param name name of this pet
      * @param age age of this pet
      */
     public Pet(String name, int age) {
+
+        //set name and age
+        this.name = name;
+        this.age = age;
     }
 
     /**
      * @return name of this pet
      */
     public String getName() {
-        return null;
+
+        //return the name of this pet
+        return name;
     }
 
     /**
      * @return age of this pet
      */
     public Integer getAge() {
-        return null;
+
+        //return the age of this pet
+        return age;
     }
 
     /**
      * @param newPetOwner the new owner of this pet
      * ensure this instance of `Pet` is added to the owner's composite `pets` list
      */
     public void setOwner(PetOwner newPetOwner) {
+
+        //set the owner of this pet
+        this.owner = newPetOwner;
+
+        //add this pet to the owner's pets list
+        if (newPetOwner != null) {
+            newPetOwner.addPet(this);
+        }
     }
 
     /**
      * @return PetOwner object whose composite `pets` collection contains this Pet instance
      */
     public PetOwner getOwner() {
-        return null;
+
+        //return the owner of this pet
+        return owner;
     }
 }

src/main/java/com/zipcodewilmington/assessment1/PetOwner.java

@@ -4,23 +4,52 @@
  * Created by leon on 2/16/18.
  */
 public class PetOwner {
+
+    private String name;
+    private List<Pet> pets; 
+
     /**
      * @param name name of the owner of the Pet
      * @param pets array of Pet object
      */
     public PetOwner(String name, Pet... pets) {
+
+        // Initialize the name and pets list
+        this.name = name;
+        // Initialize the pets list
+        this.pets = new ArrayList<>();
+        if (pets != null) {
+            // Add each pet to the list of owned pets
+            for (Pet pet : pets) {
+                addPet(pet); 
+            }
+        }
     }
 
     /**
      * @param pet pet to be added to the composite collection of Pets
      */
     public void addPet(Pet pet) {
+
+        // Check if the pet is not null and is not already in the list of owned pets
+        if (pet != null && !this.pets.contains(pet)) { 
+            // Add the pet to the list of owned pets
+            this.pets.add(pet);
+            // Set the owner of the pet to this PetOwner
+            pet.setOwner(this); 
+        }
     }
 
     /**
      * @param pet pet to be removed from the composite collection Pets
      */
     public void removePet(Pet pet) {
+
+        // Check if the pet is not null and is in the list of owned pets
+         if (pet != null && this.pets.remove(pet)) {
+            // If the pet was removed, set its owner to null
+            pet.setOwner(null); 
+        }
 
     }
 
@@ -29,14 +58,29 @@ public void removePet(Pet pet) {
      * @return true if I own this pet
      */
     public Boolean isOwnerOf(Pet pet) {
-        return null;
+
+        // Check if the pet is in the list of owned pets
+        return this.pets.contains(pet);
     }
 
     /**
      * @return the age of the Pet object whose age field is the lowest amongst all Pets in this class
      */
     public Integer getYoungetPetAge() {
-        return null;
+
+        // If there are no pets, return 0
+        if (pets.isEmpty()) {
+            return 0;
+        }
+        // Find the youngest pet's age
+        Integer youngestAge = Integer.MAX_VALUE;
+        for (Pet pet : pets) {
+            if (pet.getAge() < youngestAge) {
+                youngestAge = pet.getAge();
+            }
+        }
+        // Return the youngest age found
+        return youngestAge;
     }
 
 
@@ -46,35 +90,66 @@ public Integer getYoungetPetAge() {
      * @return the age of the Pet object whose age field is the highest amongst all Pets in this class
      */
     public Integer getOldestPetAge() {
-        return null;
+
+        // If there are no pets, return 0
+        if (pets.isEmpty()) {
+            return 0;
+        }
+        // Find the oldest pet's age
+        Integer oldestAge = Integer.MIN_VALUE;
+
+        // Iterate through the pets list to find the oldest age
+        for (Pet pet : pets) {
+            if (pet.getAge() > oldestAge) {
+                oldestAge = pet.getAge();
+            }
+        }
+        // Return the oldest age found
+        return oldestAge;
     }
 
 
     /**
      * @return the sum of ages of Pet objects stored in this class divided by the number of Pet object
      */
     public Float getAveragePetAge() {
-        return null;
+
+        // If there are no pets, return 0
+        if (pets.isEmpty()) {
+            return 0.0;
+        }
+        // Calculate the total age of all pets and divide by the number of pets
+        double totalAge = 0;
+        for (Pet pet : pets) {
+            totalAge += pet.getAge();
+        }
+        return totalAge / pets.size();
     }
 
     /**
      * @return the number of Pet objects stored in this class
      */
     public Integer getNumberOfPets() {
-        return null;
+
+        // Return the size of the pets list
+        return pets.size();
     }
 
     /**
      * @return the name property of the Pet
      */
     public String getName() {
-        return null;
+
+        // Return the name of the PetOwner
+        return name;
     }
 
     /**
      * @return array representation of animals owned by this PetOwner
      */
     public Pet[] getPets() {
-        return null;
+
+        // Convert the list of pets to an array and return it
+        return pets.toArray(new Pet[0]);
     }
 }