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feat: complete Lesson 16 Cat class with custom exception, enum and tests (#497)
* feat: complete Lesson 16 Cat class with custom exception,enum and tests * Fix: formatting issue in Cat.java * chore: issues on Cat.java and CatTest.java, tests were failing * chore: fix formatting issues in Cat.java and CatTest.java
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  • lesson_16/objects/objects_app/src
    • main/java/com/codedifferently/lesson16/cutecat
    • test/java/com/codedifferently/lesson16/cutecat

2 files changed

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‎lesson_16/objects/objects_app/src/main/java/com/codedifferently/lesson16/cutecat/Cat.java

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package com.codedifferently.lesson16.cutecat;
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import java.util.ArrayList;
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import java.util.Arrays;
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// Exception
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class InvalidCatNameException extends Exception {
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public InvalidCatNameException(String message) {
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super(message);
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}
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}
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// Enum for Cat Breed
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enum Breed {
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SIAMESE,
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PERSIAN,
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MAINCOON,
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SPHYNX,
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BENGAL,
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UNKNOWN
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}
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public class Cat {
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// Member variables
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public String name;
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public int age;
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public double weight;
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public boolean isIndoor;
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public Breed breed;
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public ArrayList<String> favoriteFoods;
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public boolean isFemale;
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// Constructor
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public Cat(String name, int age, double weight, Breed breed, boolean isIndoor, boolean isFemale)
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throws InvalidCatNameException {
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if (name == null || name.trim().isEmpty()) {
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throw new InvalidCatNameException("Cat name cannot be empty.");
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}
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this.name = name;
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this.age = age;
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this.weight = weight;
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this.isIndoor = isIndoor;
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this.breed = breed;
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this.isFemale = isFemale;
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this.favoriteFoods =
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new ArrayList<>(Arrays.asList("Fancy Feast", "Purina Naturals")); // Default for Ninja
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}
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// Function 1: Add Favorite Food (uses collection)
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public void addfavoriteFood(String food) {
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favoriteFoods.add(food);
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}
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// Function 2: Print Favorite Foods (uses loop)
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public void printfavoriteFoods() {
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System.out.println(name + "'s favorite foods:");
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for (String v : favoriteFoods) {
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System.out.println("- " + v);
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}
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}
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// Function 3: Is the cat a senior? (uses conditional)
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public boolean isSenior() {
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return age >= 10;
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}
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// Getters for testing
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public String getName() {
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return name;
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}
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public int getAge() {
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return age;
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}
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public double getWeight() {
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return weight;
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}
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public boolean getIsIndoor() {
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return isIndoor;
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}
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public Breed getBreed() {
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return breed;
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}
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public ArrayList<String> getfavoriteFoods() {
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return favoriteFoods;
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}
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public String meow() {
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return "Meow!";
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}
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public String walk() {
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return name + " is walking.";
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}
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public String sleep() {
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return name + " is sleeping.";
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}
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public boolean isKitten() {
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return age < 1;
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}
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public String play() {
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return name + " is playing.";
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}
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public String scratchFurniture() {
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return name + " is scratching furniture.";
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}
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public String useLitterbox() {
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return name + " is using the litterbox.";
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}
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public enum Gender {
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MALE,
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FEMALE
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}
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}

‎lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/cutecat/CatTest.java

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package com.codedifferently.lesson16.cutecat;
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import static org.junit.jupiter.api.Assertions.*;
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import java.util.ArrayList;
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import org.junit.jupiter.api.Test;
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public class CatTest {
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@Test
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public void testCreateNinjaCat() throws InvalidCatNameException {
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Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true, false);
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assertEquals("Ninja", cat.getName());
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assertEquals(13, cat.getAge());
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assertEquals(9.3, cat.getWeight());
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assertTrue(cat.getIsIndoor());
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assertEquals(Breed.MAINCOON, cat.getBreed());
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}
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@Test
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public void testfavoriteFoodsDefault() throws InvalidCatNameException {
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Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true, false);
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ArrayList<String> foods = cat.getfavoriteFoods();
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assertTrue(foods.contains("Fancy Feast"));
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assertTrue(foods.contains("Purina Naturals"));
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assertEquals(2, foods.size());
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}
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@Test
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public void testPrintFavoriteFoodsCoverage() throws InvalidCatNameException {
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Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true, false);
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cat.printfavoriteFoods();
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}
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@Test
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public void testAddFavoriteFood() throws InvalidCatNameException {
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Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true, false);
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cat.addfavoriteFood("Tuna");
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ArrayList<String> foods = cat.getfavoriteFoods();
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assertTrue(foods.contains("Tuna"));
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assertEquals(3, foods.size());
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}
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@Test
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public void testIsSenior() throws InvalidCatNameException {
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Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true, false);
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assertTrue(cat.isSenior());
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}
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@Test
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public void testCatName() throws InvalidCatNameException {
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Cat cat = new Cat("Whiskers", 5, 5.4, Breed.SPHYNX, false, true);
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assertEquals("Whiskers", cat.getName());
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}
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@Test
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public void testCatMeow() throws InvalidCatNameException {
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Cat cat = new Cat("Mittens", 2, 8.9, Breed.SIAMESE, true, true);
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assertEquals("Meow!", cat.meow());
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}
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@Test
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public void testGetName() throws InvalidCatNameException {
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Cat cat = new Cat("Shadow", 2, 7.4, Breed.BENGAL, true, true);
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assertEquals("Shadow", cat.getName());
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}
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@Test
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public void testGetAge() throws InvalidCatNameException {
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Cat cat = new Cat("Nine", 2, 13.2, Breed.MAINCOON, true, false);
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assertEquals(2, cat.getAge());
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}
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@Test
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public void testMeow() throws InvalidCatNameException {
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Cat cat = new Cat("Frisky", 2, 5.4, Breed.UNKNOWN, true, true);
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assertEquals("Meow!", cat.meow());
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}
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@Test
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public void testWalk() throws InvalidCatNameException {
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Cat cat = new Cat("Shadow", 2, 7.4, Breed.BENGAL, true, false);
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assertEquals("Shadow is walking.", cat.walk());
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}
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@Test
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public void testSleep() throws InvalidCatNameException {
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Cat cat = new Cat("Shadow", 2, 7.4, Breed.BENGAL, true, false);
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assertEquals("Shadow is sleeping.", cat.sleep());
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}
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@Test
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public void testisKittenTrue() throws InvalidCatNameException {
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Cat cat = new Cat("Tiny", 0, 2.5, Breed.PERSIAN, true, true);
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assertTrue(cat.isKitten());
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}
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@Test
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public void testIsKittenFalse() throws InvalidCatNameException {
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Cat cat = new Cat("Trinity", 3, 5.6, Breed.UNKNOWN, true, true);
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assertFalse(cat.isKitten());
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}
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}

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