feat: complete Lesson 16 Cat class with custom exception,enum and tests

Author: Ananatawa

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

@@ -0,0 +1,66 @@
+package com.codedifferently.lesson16.cutecat;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+//Exception
+class InvalidCatNameException extends Exception {
+    public InvalidCatNameException (String message) {
+        super(message);
+    }
+}
+
+// Enum for Cat Breed
+enum Breed {
+    SIAMESE, PERSIAN, MAINCOON, SPHYNX, BENGAL, UNKNOWN
+}
+
+public class Cat {
+    // Member variables
+    private String name;
+    private int age;
+    private double weight;
+    private boolean isIndoor;
+    private Breed breed;
+    private ArrayList<String> favoriteFoods;
+
+    // Constructor
+    public Cat(String name, int age, double weight, Breed breed, boolean isIndoor) throws InvalidCatNameException {
+         if (name == null || name.trim().isEmpty()) {
+            throw new InvalidCatNameException("Cat name cannot be empty.");
+        }
+        this.name = name;
+        this.age = age;
+        this.weight = weight;
+        this.isIndoor = isIndoor;
+        this.breed = breed;
+        this.favoriteFoods = new ArrayList<>(Arrays.asList("Fancy Feast", "Purina Naturals")); //Default for Ninja
+    }
+
+    // Function 1: Add Favorite Food (uses collection)
+    public void addfavoriteFood(String food) {
+        favoriteFoods.add(food);
+    }
+
+    //Function 2: Print Favorite Foods (uses loop)
+    public void printfavoriteFoods() {
+        System.out.println(name + "'s favorite foods:");
+        for (String v : favoriteFoods) {
+            System.out.println("- " + v);
+        }
+    }
+
+    // Function 3: Is the cat a senior? (uses conditional)
+    public boolean isSenior() {
+        return age >= 10;
+    }
+
+    // Getters for testing
+    public String getName() { return name; }
+    public int getAge() { return age; }
+    public double getWeight() { return weight; }
+    public boolean getIsIndoor() { return isIndoor; }
+    public Breed getBreed() { return breed; }
+    public ArrayList<String> getfavoriteFoods() {return favoriteFoods; }
+    }    
+}

lesson_16/objects/objects_app/src/test/cutecat/CatTest.java

@@ -0,0 +1,56 @@
+package com.codedifferently.lesson16.cutecat;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+import java.util.ArrayList;
+
+public class CatTest {
+
+    @Test 
+    public void testCreateNinjaCat() throws InvalidCatNameException {
+        Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true);
+        assertEquals("Ninja", cat.getName());
+        assertEquals(13, cat.getAge());
+        assertEquals(9.3, cat.getWeight());
+        assertTrue(cat.getIsIndoor());
+        assertEquals(Breed.MAINCOON, cat.getBreed());
+    }
+
+    @Test
+    public void testfavoriteFoodsDefault() throws InvalidCatNameException {
+        Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true);
+        ArrayList<String> foods = cat.getfavoriteFoods();
+        assertTrue(foods.contains("Fancy Feast"));
+        assertTrue(foods.contains("Purina Naturals"));
+        assertEquals(2, foods.size());      
+    }
+
+    @Test 
+    public void testPrintFavoriteFoodsCoverage() throws InvalidCatNameException {
+        Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true);
+        cat.printfavoriteFoods(); 
+    }
+
+    @Test
+    public void testAddFavoriteFood() throws InvalidCatNameException {
+        Cat cat = new Cat("Ninja", 13,9.3, Breed.MAINCOON, true);
+        cat.addfavoriteFood("Tuna");
+        ArrayList<String> foods = cat.getfavoriteFoods();
+        assertTrue(foods.contains("Tuna"));
+        assertEquals(3, foods.size());
+    }
+
+    @Test
+    public void testIsSenior() throws InvalidCatNameException {
+        Cat cat = new Cat("Ninja", 13, 9.3, Breed.MAINCOON, true);
+        assertTrue(cat.isSenior());
+    }
+
+    @Test
+    public void testInvalidNameThrowsException() {
+        assertThrows(InvalidCatNameException.class, () -> {
+            new Cat("", 13, 9.3, Breed.MAINCOON, true);
+        });       
+    }
+    
+}