OOP: Abstraction

slgobinath · slgobinath · commit d0a513fc704c · 2015-02-11T07:51:06.000+05:30
diff --git a/objectorientedprogramming/abstraction/doctorsolution/DoctorDemo.java b/objectorientedprogramming/abstraction/doctorsolution/DoctorDemo.java
@@ -0,0 +1,75 @@
+/**
+ * Sample code used to explain Object Oriented Programming.
+ * 1.0  -   The orginal source code.
+ * 1.1  -   All the properties of Animals have been encapsulated.
+ * 1.2  -   Inheritance is applied by introducing a super class Animal.
+ * 1.3  -   The treatment logic has been moved to the Animals.
+ * 1.4  -   Abstraction is applied to the Animal class and the treatment method.
+ *
+ * @version 1.4
+ * @author L.Gobinath
+ */
+public class DoctorDemo {
+    public static void main(String[] args) {
+        Cat cat = new Cat();
+        Dog dog = new Dog();
+        VeterinaryDoctor doctor = new VeterinaryDoctor();
+        cat.setAge(4);
+        dog.setAge(2);
+        doctor.giveTreatment(cat);
+        doctor.giveTreatment(dog);
+    }
+}
+
+class VeterinaryDoctor {
+    /**
+     * Give treatment to any Animals.
+     * @param animal The animal.
+     */
+    public void giveTreatment(Animal animal) {
+        animal.treatment();
+    }
+}
+/**
+ * Super class Animal.
+ * Animal is an abstract class.
+ */
+abstract class Animal {
+    private int age;
+
+    public int getAge() {
+        return this.age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    /**
+     * Abstract method.
+     * Sub classes must override this method.
+     */
+    public abstract void treatment();
+}
+
+class Cat extends Animal {
+    @Override
+    public void treatment() {
+        if (getAge() < 3) {
+            System.out.println("Treatment C1");
+        } else {
+            System.out.println("Treatment C2");
+        }
+    }
+}
+
+class Dog extends Animal {
+    @Override
+    public void treatment() {
+        if (getAge() < 5) {
+            System.out.println("Treatment D1");
+        } else {
+            System.out.println("Treatment D2");
+        }
+    }
+}
