11) Facade Pattern

/* Complex parts */

public class FacadePatternDemo {
    public static void main(String[] args) {
        CarFacade facade = new CarFacade();
        facade.CreateCompleteCar();

    }
}

// The 'Subsystem ClassA' class
class CarModel {
    public void SetModel() {
        System.out.println(" CarModel - SetModel");
    }
}

/// <summary>
/// The 'Subsystem ClassB' class
/// </summary>
class CarEngine {
    public void SetEngine() {
        System.out.println(" CarEngine - SetEngine");
    }
}

// The 'Subsystem ClassC' class
class CarBody {
    public void SetBody() {
        System.out.println(" CarBody - SetBody");
    }
}

// The 'Subsystem ClassD' class
class CarAccessories {
    public void SetAccessories() {
        System.out.println(" CarAccessories - SetAccessories");
    }
}

// The 'Facade' class
class CarFacade {
    private CarAccessories accessories;
    private CarBody body;
    private CarEngine engine;
    private CarModel model;

    public CarFacade() {
        accessories = new CarAccessories();
        body = new CarBody();
        engine = new CarEngine();
        model = new CarModel();
    }

    public void CreateCompleteCar() {
        System.out.println("******** Creating a Car **********");
        model.SetModel();
        engine.SetEngine();
        body.SetBody();
        accessories.SetAccessories();

        System.out.println("******** Car creation is completed. **********");
    }
}

******** Creating a Car **********
 CarModel - SetModel
 CarEngine - SetEngine
 CarBody - SetBody
 CarAccessories - SetAccessories
******** Car creation is completed. **********