When to use the abstract factory pattern?
When to use Abstract Factory Design Method?
- When the client doesn’t need to know how the final product is actually created.
- When the system demands the creation of a library of products, for which only interfaces are required, not the implementation.
- When the system needs to be configured with one of a multiple-family of objects.
How to use factory design pattern?
When to use the Factory Design Pattern in real-time applications?
- The Object needs to be extended to the subclasses
- Classes don’t know what exact sub-classes it has to create
- The Product implementation going to change over time and the Client remains unchanged
What is abstract factory method?
abstract factory is one level higher in abstraction than factory method. factory method abstracts the way objects are created , while abstract factory also abstracts the way factories are created which in turn abstracts the way objects are created.
What is an abstract factory?
Abstract Factory patterns work around a super-factory which creates other factories. This factory is also called as factory of factories. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object.
Where is factory design pattern used?
The factory design pattern is used when we have a superclass with multiple sub-classes and based on input, we need to return one of the sub-class. This pattern takes out the responsibility of the instantiation of a class from the client program to the factory class.
What is the use of Abstract Factory design pattern in Java?
Abstract Factory design pattern provides approach to code for interface rather than implementation. Abstract Factory pattern is “factory of factories” and can be easily extended to accommodate more products, for example we can add another sub-class Laptop and a factory LaptopFactory.
What problem does Abstract Factory solve?
The Abstract Factory design pattern solves problems like: How can an application be independent of how its objects are created? How can a class be independent of how the objects it requires are created? How can families of related or dependent objects be created?
What benefit does the Abstract Factory pattern provide?
The Abstract Factory pattern helps you control the classes of objects that an application creates. Because a factory encapsulates the responsibility and the process of creating product objects, it isolates clients from implementation classes. Clients manipulate instances through their abstract interfaces.
What are the applications of Factory Pattern?
Factory Method Pattern allows the sub-classes to choose the type of objects to create. It promotes the loose-coupling by eliminating the need to bind application-specific classes into the code.
What is factory and Abstract Factory pattern demonstrate with example?
Abstract Factory provides interfaces for creating families of related or dependent objects without specifying their concrete classes. Client software creates a concrete implementation of the abstract factory and then uses the generic interfaces to create the concrete objects that are part of the family of objects.
What are two capabilities of the Abstract Factory pattern?
Advantage of Abstract Factory Pattern Abstract Factory Pattern isolates the client code from concrete (implementation) classes. It eases the exchanging of object families. It promotes consistency among objects.
What is the difference between Factory Method and Abstract Factory?
Factory Method pattern is responsible for creating products that belong to one family, while Abstract Factory pattern deals with multiple families of products. Factory Method uses interfaces and abstract classes to decouple the client from the generator class and the resulting products.
What problem does factory pattern solve?
The factory pattern aims to solve a fundamental problem in instantiation – i.e., the creation of a concrete object of a class – in object-oriented programming. In principle, creating an object directly within the class that needs or should use this object is possible, but very inflexible.
What are the consequences of applying the Abstract Factory pattern?
Abstract-Factory Pattern { consequence: The Abstract Factory pattern has the following beneets and liabilities: 1. It isolates concrete classes. 2. It makes exchanging product families easy.
Which pattern should be used for file system implementation?
File System implementations use the composite design pattern as described previously.
What is the difference between factory and Abstract Factory pattern in Java?
The main difference between factory pattern and abstract factory pattern is that the factory pattern provides a method of creating objects without specifying the exact class used to create it while the abstract factory pattern provides a method to combine a group of individual factories without specifying their ...
When would you apply the builder design pattern?
Builder pattern aims to “Separate the construction of a complex object from its representation so that the same construction process can create different representations.” It is used to construct a complex object step by step and the final step will return the object.
What design pattern should be used to abstract a function that can have many implementations?
The bridge pattern is a design pattern used in software engineering that is meant to "decouple an abstraction from its implementation so that the two can vary independently", introduced by the Gang of Four.
What is factory design pattern with real time example?
The factory design pattern says that define an interface ( A java interface or an abstract class) for creating object and let the subclasses decide which class to instantiate. The factory method in the interface lets a class defers the instantiation to one or more concrete subclasses.
What is the advantage of factory design pattern?
Advantage of Factory Design Pattern Factory Method Pattern allows the sub-classes to choose the type of objects to create. It promotes the loose-coupling by eliminating the need to bind application-specific classes into the code.
What is factory design pattern in OOP?
The factory method is a creational design pattern, i.e., related to object creation. In the Factory pattern, we create objects without exposing the creation logic to the client and the client uses the same common interface to create a new type of object.
Which of the following describes the Abstract Factory pattern correctly?
In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface. Q 8 - Which of the following is correct about Abstract Factory design pattern. A - This type of design pattern comes under creational pattern.
Why do we use design patterns in java?
By using the design patterns you can make your code more flexible, reusable and maintainable. It is the most important part because java internally follows design patterns. To become a professional software developer, you must know at least some popular solutions (i.e. design patterns) to the coding problems.
Why is it called factory design pattern?
In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created.
What is the use of design patterns in java?
By using the design patterns you can make your code more flexible, reusable and maintainable. It is the most important part because java internally follows design patterns. To become a professional software developer, you must know at least some popular solutions (i.e. design patterns) to the coding problems.
How does Abstract Factory pattern work?
Abstract Factory patterns work around a super-factory which creates other factories. This factory is also called as factory of factories. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object.
What are the consequences of applying the Abstract Factory pattern?
Abstract-Factory Pattern { consequence: The Abstract Factory pattern has the following beneets and liabilities: 1. It isolates concrete classes. 2. It makes exchanging product families easy.
What is the reason for studying design pattern?
The most commonly stated reasons for studying patterns are because patterns allow us to: Reuse solutions— By reusing already established designs, I get a head start on my problems and avoid gotchas. I get the benefit of learning from the experience of others.
Why is the Abstract Factory pattern important?from geeksforgeeks.org
Because a factory encapsulates the responsibility and the process of creating product objects, it isolates clients from implementation classes. Clients manipulate instances through their abstract interfaces. Product class names are isolated in the implementation of the concrete factory; they do not appear in client code.
Why does the factory object use a hashmap?from oodesign.com
The registration is made from outside of the factory and because the objects are created using reflection the factory is not aware of the objects types.
How does a factory object insulate client code from object creation?from en.wikipedia.org
This insulates client code from object creation by having clients ask a factory object to create an object of the desired abstract type and to return an abstract pointer to the object.
What is the difference between abstract and factory?from geeksforgeeks.org
The factory method is just a method, it can be overridden in a subclass, whereas the abstract factory is an object that has multiple factory methods on it.
What is factory instantiation?from oodesign.com
The factory instantiates a new concrete product and then returns to the client the newly created product (casted to abstract product class).
What is product in concrete?from geeksforgeeks.org
Product: Defines a product object to be created by the corresponding concrete factory and implements the AbstractProduct interface.
When you design an application, do you need a factory?from oodesign.com
When you design an application just think if you really need it a factory to create objects. Maybe using it will bring unnecessary complexity in your application. If you have many objects of the same base type and you manipulate them mostly casted to abstract types, then you need a factory. If you're code should have a lot of code like the following, you should reconsider it:
What is abstract factory pattern?
The abstract factory pattern is one of the classic Gang of Four creational design patterns used to create families of objects, where the objects of a family are designed to work together . In the abstract factory pattern you provide an interface to create families of related or dependent objects, but you do not specify the concrete classes of the objects to create. From the client point of view, it means that a client can create a family of related objects without knowing about the object definitions and their concrete class names.
Why is the factory method pattern the same as the abstract factory pattern?
It is easy to confuse the abstract factory pattern with the factory method pattern because both design patterns deal with object creation. Both the patterns advocates the Object Oriented Programming (OOP) principle “ Program to an interface, not an implementation ” to abstract how the objects are created. Both design patterns help in creating client code that is loosely-coupled with object creation code, but despite the similarities, and the fact that both the patterns are often used together, they do have distinct differences.
What is System.out.println?
System.out.println("Preparing ingredients for pepperoni pizza.");
What is the difference between abstract and factory?
From implementation point of view, the key difference between the factory method and abstract factory patterns is that factory method is just a method to create objects of a single type, while abstract factory is an object to create families ...
Can an abstract factory use factory methods?
In other words, we can say that an abstract factory object can use factory methods, one for each product to create. We are saying “ can use ” because, though this is the most common approach, it is not the only approach. Another approach is to use the Prototype pattern in an abstract factory to create products.
What is an abstract factory?
In simple words we can say, the Abstract Factory is a super factory that creates other factories. This Abstract Factory is also called the Factory of Factories.
What are the two subclasses of the Animal Factory?
So, here we have two factories i.e. Land Animal Factory and Sea Animal Factory. Please have a look at the following diagram. The Land Animal Factory and Sea Animal Factory are the subclasses of Animal Factory. Here, the Animal Factory is nothing but your Abstract Factory.
What class will implement the speak method?
The Cat class will implement that Speak method and return Meow. Similarly, the Lion class will implement the Speak () method and will return Roar and in the say the Dog class will implement the Speak () method and return Bark bark. The Cat, Lion, and Dog are living in the Land, so they belong to the Land Animal group.
When to use Abstract Factory Design Method?
When the client doesn’t need to know how the final product is actually created.
When does the Abstract Factory Design Method make sense?
Abstract Factory Design Method makes sense only when the system has “ Product Families “.
Why is it important to create objects in a concrete way?
Another benefit of creating objects this way is that when the addition of new concrete types is needed, all we have to do is modify the client code and make it use a different factory, which is far easier than instantiating a new type, which requires changing the code wherever a new object is created .
What is a laptop factory?
LaptopFactory is an interface acting as an Abstract Factory in our example. It contains declaration of common methods.
What is abstract factory?
Abstract Factory makes use of factory method pattern. Abstract Factory is an object with multiple factory methods.
What does createlaptop do?
createLaptop (LaptopFactory laptopFactory) accepts ConcreteFactory object i .e AppleLaptop or DellLaptop. Both these objects accepts Storage Size as a constructor parameter.
What is an abstract factory?
Abstract factory or any factory for that matter, they exist to solve the same problem, i.e, "Abstraction of object creation". It usually abstracts the following: if condition to decide which object to instantiate. new operator, instantiation of an object. The responsibility of a factory is just that in a nutshell.
How to tell if a factory is not an abstract factory?
The simplest clue that indicates a factory does not conform to the Abstract Factory Pattern is to count the abstract products the factory produces (I used the term "product interfaces" in place of "abstract products" to avoid overuse of the word "abstract"). A factory that produces a single abstract product cannot be an Abstract Factory, because by definition, Abstract Factory produces a family of related products. It's critical to note this familyis not referring to different implementations of one interface, but rather to products with different, related interfaces.
What happens if you use abstract factory?
But if you are using abstract factory, then she can provide a factory and pass to your code and everything is fine.
What is factory interface?
Define a factory interfacethat consists of a factory method per product.
What is a design pattern?
1. If you look at the design patterns, almost all of them can be made redundant. But what pattern means a commonly used approach for a solution to a similar type of problems. A design pattern provides you a design level approach or solution to a set of similar type of design problem.
Should you create abstractions and not concrete classes?
it easy, imaging that you have a code that works with the abstraction, you should create abstractions and not concrete classes. You should always work against abstractions because you can modify the code better. This is a good example: http://en.wikipedia.org/wiki/Abstract_factory_pattern#C.23. Share.
Factories
In the real world, a factory is a building that produces one or more products. A steel factory might produce beams & sheets, while a shoe factory might produce all the colorways & sizes for both a running and a tennis shoe.
Factory for Factory
Now, we can imagine that each kind of Enemy has its own kind of weapon that shoots differently behaving Projectiles: bullets from a pistol and bombs from a carpet bomb. Let’s assume that only ground enemies can use pistols, and only flying enemies can use carpet bombs. How can the client create Projectiles that match with the Enemy?
Drawback
This is all nice when you want to deal with multiple sets of coherent objects that have the same interface. But what if they don’t have the same interface, ie inconsistent object set interfaces?
When to use it
The Abstract Factory pattern can be used when you have two object sets with very similar, if not the same, interfaces, but each set needs to be used coherently (those objects only work with other objects from the set, and not from a different set). This occurs in UI toolkits, games, and many more domains.
Motivation
Modularization is a big issue in today's programming. Programmers all over the world are trying to avoid the idea of adding code to existing classes in order to make them support encapsulating more general information. Take the case of a information manager which manages phone number.
Intent
Abstract Factory offers the interface for creating a family of related objects, without explicitly specifying their classes.
Implementation
AbstractFactory - declares a interface for operations that create abstract products.
Applicability & Examples
the system needs to be independent from the way the products it works with are created.
Specific problems and implementation
The Abstract Factory pattern has both benefits and flaws. On one hand it isolates the creation of objects from the client that needs them, giving the client only the possibility of accessing them through an interface, which makes the manipulation easier.
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What is this pattern used for?
It provides an interface to create families of related or dependent objects without specifying their concrete classes.
How does it work?
The application will use a component factory that will take care of generating the appropriate buttons and navigation bars, without the application having to worry about the details. To achieve that, we create three abstract classes, which are those with which the application will have contact, rather than their concrete implementations:
Benefits
It encapsulates the creation of objects in a class (the factory) instead of creating them directly.
What is the difference between AbstractFactory Pattern and Factory Method Design Pattern?
AbstractFactory pattern uses composition to delegate responsibility of creating object to another class while Factory method design pattern uses inheritance and relies on derived class or sub class to create object
What is the factory method?
Factory Method: Define an interface for creating an object, but let the subclasses decide which class to instantiate. The Factory method lets a class defer instantiation to subclasses
What is product in a factory?
Product: It defines an interface of the objects the Factory method creates.
Why is design pattern important?
Every design pattern strives to help ensure that written, working code is not touched. We all know that once we touch working code, there are defects in existing working flows, and a lot more testing needs to get done to ensure that we did not break anything.
Can you use abstract factory at core?
Now, if you envision adding another website to your portfolio, and you believe that the same core be used, for example, a carpooling website, which now searches for cab's and makes payments online, you can use a abstract factory at your core. This way you can just snap in one more factory of cabs and carpools.
Do both factories have to do with each other?
Both factories have nothing to do with each other, so it's a good design to keep them in different factories.
Can you use more than one factory method in Abstract Factory?
But Abstract Factory having more than 1 factory method ( ex: 2 factory methods), using those factory methods it will create the set of objects/ related objects. Using Abstract Factory, user can able to create A1, B1 objects of AbstractProductA, AbstractProductB
Abstract Factory Pattern vs Factory Method Pattern
Participants in The Abstract Factory Pattern
- To understand how the abstract factory pattern works, let us revisit the pizza store that we developed in the Factory Method Design Pattern post. The store has seen a rapid increase in its customer base and now wants to serve their existing types of pizzas: cheese, pepperoni, and veggie in two different topping styles: Sicilian topping and Gourmet topping. Each topping style …
Applying The Abstract Factory Pattern
- To apply the abstract factory pattern in the pizza store application, let us first create the products that the factories will produce. Cheese.java GoatCheese.java MozzarellaCheese.java Sauce.java TomatoSauce.java CaliforniaOilSauce.java In the above examples, we wrote the CheeseCheese interface, which is an AbstractProduct. Then we wrote the GoatCheeseGoatCheese and Mozzar…
Conclusion
- As you get further into enterprise application development, you will you will encounter use cases for the abstract factory pattern, especially as the objects you’re creating become more complex. Its not uncommon to start off using the factory method design pattern and have your code evolve into using the abstract factory design pattern. Often you’l...