#DP : Factory Pattern

Author: dhananjay-ng

.idea/workspace.xml

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+package designpatterns.creational.factory;
+
+public abstract class Car {
+    private CarType model;
+
+    public Car(CarType carType) {
+        this.model = carType;
+        arrangeParts();
+
+    }
+
+    private void arrangeParts() {
+        // common logic  here
+    }
+
+    //each car subclass will construct car in different way
+    protected abstract void construct();
+
+    public CarType getModel() {
+        return model;
+    }
+
+    public void setModel(CarType model) {
+        this.model = model;
+    }
+
+
+}

src/main/java/designpatterns/creational/factory/Car.java

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+package designpatterns.creational.factory;
+
+public class CarFactory {
+    public static Car buildCar(CarType carType) {
+        Car car;
+
+        switch (carType) {
+
+            case SMALL:
+                car = new SmallCar();
+                break;
+
+            case SEDAN:
+                car = new SedanCar();
+                break;
+
+            case LUXURY:
+                car = new LuxuryCar();
+                break;
+
+            default:
+                throw new RuntimeException();
+        }
+        return car;
+    }
+}

src/main/java/designpatterns/creational/factory/CarFactory.java

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+package designpatterns.creational.factory;
+
+public enum CarType {
+    SMALL,
+    SEDAN,
+    LUXURY
+}

src/main/java/designpatterns/creational/factory/CarType.java

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+package designpatterns.creational.factory;
+
+public class LuxuryCar extends Car {
+
+    public LuxuryCar() {
+        super(CarType.LUXURY);
+        construct();
+    }
+
+    @Override
+    protected void construct() {
+        System.out.println("Building Luxury Car ..");
+
+    }
+}

src/main/java/designpatterns/creational/factory/LuxuryCar.java

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+package designpatterns.creational.factory;
+
+public class SedanCar extends Car {
+
+    SedanCar() {
+        super(CarType.SEDAN);
+        construct();
+    }
+
+    @Override
+    protected void construct() {
+        System.out.println("Building sedan car..");
+        // add accessories
+    }
+}

src/main/java/designpatterns/creational/factory/SedanCar.java

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+package designpatterns.creational.factory;
+
+public class SmallCar extends Car {
+
+    SmallCar() {
+        super(CarType.SMALL);
+        construct();
+    }
+
+    @Override
+    protected void construct() {
+        System.out.println("Building small car..");
+        // add accessories
+    }
+}

src/main/java/designpatterns/creational/factory/SmallCar.java

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+package designpatterns.creational.factory;
+
+public class TestCarFactory {
+    public static void main(String[] args) {
+        System.out.println(CarFactory.buildCar(CarType.SMALL));
+        System.out.println(CarFactory.buildCar(CarType.SEDAN));
+        System.out.println(CarFactory.buildCar(CarType.LUXURY));
+    }
+}