Moving Directory

Java Classes & Interfaces/Interfaces/Animals/src/Animal.java

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+package src;
+
+public interface Animal {
+    
+    String animalName();
+    String animalSound();
+    double animalPrice();
+
+}

Java Classes & Interfaces/Interfaces/Animals/src/AnimalHelper.java

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+package src;
+
+public class AnimalHelper {
+
+    private final Animal[] animals;
+    private double averagePrice;
+
+    public AnimalHelper(Animal[] animals) {
+        this.animals = animals;
+    }
+
+    public void displayInformation() {
+        /* Display the animal information */
+
+        int total = 0;
+        double sum = 0.0;
+
+        for (Animal animal : animals) {
+            StringBuilder stringBuilder = new StringBuilder();
+
+            stringBuilder.append("\n\nName: " + animal.animalName());
+            stringBuilder.append("\nSound: " + animal.animalSound());
+            stringBuilder.append("\nPrice: £" + animal.animalPrice());
+
+            System.out.println(stringBuilder.toString());
+
+            total++;
+            sum += animal.animalPrice();
+        }
+        averagePrice = sum / total;
+    }
+
+    public void displayAveragePrice() {
+        /* Display the average price of all the animals */
+
+        System.out.printf("%nThe Average Price For All The Animals Are: £%.2f", averagePrice);
+    }
+}

Java Classes & Interfaces/Interfaces/Animals/src/AnimalMain.java

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+package src;
+
+public class AnimalMain {
+    public static void main(String[] args) {
+        displayAnimals();
+    }
+
+    private static void displayAnimals() {
+
+        // Creating an array of animal objects
+        AnimalHelper helper = new AnimalHelper(new Animal[] { new Cow(), new Cat(), new Dog(), new Horse() });
+
+        // Displaying information about the animals
+        helper.displayInformation();
+        helper.displayAveragePrice();
+    }
+}

Java Classes & Interfaces/Interfaces/Animals/src/Cat.java

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+package src;
+
+public class Cat implements Animal {
+
+    @Override
+    public String animalName() {
+        return "Cat";
+    }
+
+    @Override
+    public String animalSound() {
+        return "Meoooww";
+    }
+
+    @Override
+    public double animalPrice() {
+        return 29.99;
+    }
+
+}

Java Classes & Interfaces/Interfaces/Animals/src/Cow.java

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+package src;
+
+public class Cow implements Animal {
+
+    @Override
+    public String animalName() {
+        return "Cow";
+    }
+
+    @Override
+    public String animalSound() {
+        return "Moooo";
+    }
+
+    @Override
+    public double animalPrice() {
+        return 10.99;
+    }
+
+}

Java Classes & Interfaces/Interfaces/Animals/src/Dog.java

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+package src;
+
+public class Dog implements Animal {
+
+    @Override
+    public String animalName() {
+        return "Dog";
+    }
+
+    @Override
+    public String animalSound() {
+        return "Woof Woof";
+    }
+
+    @Override
+    public double animalPrice() {
+        return 15.99;
+    }
+
+}

Java Classes & Interfaces/Interfaces/Animals/src/Horse.java

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+package src;
+
+public class Horse implements Animal {
+
+    @Override
+    public String animalName() {
+        return "Horse";
+    }
+
+    @Override
+    public String animalSound() {
+        return "Neighh";
+    }
+
+    @Override
+    public double animalPrice() {
+        return 59.99;
+    }
+
+}