What is factory and Abstract Factory pattern?
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. The Factory Method pattern uses inheritance and relies on a subclass to handle the desired object instantiation.
Can we use abstract class in factory design pattern?
Yes, as also a java 8 interface with an implemented default method.
What is the key strategy in the Abstract Factory?
Abstract Factory Pattern says that just define an interface or abstract class for creating families of related (or dependent) objects but without specifying their concrete sub-classes. That means Abstract Factory lets a class returns a factory of classes.
Is Abstract Factory a factory of factories?
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 is Abstract Factory class in Java?
Abstract Factory is a creational design pattern, which solves the problem of creating entire product families without specifying their concrete classes. Abstract Factory defines an interface for creating all distinct products but leaves the actual product creation to concrete factory classes.
Should a factory class have an interface?
So, if you want to be able to supply different factory implementations, you can declare a common interface for your factories. If your factory only serves to keep your callers away from direct invocations of the target constructor, you do not need the factory interface.
How do you create a factory class in Java?
Design Pattern – Factory Pattern
- Implementation.
- Create an interface.
- Create concrete classes implementing the same interface.
- Create a Factory to generate object of concrete class based on given information.
- Use the Factory to get object of concrete class by passing an information such as type.
- Verify the output.
Which of the following is a disadvantage of using Abstract Factory design pattern?
Disadvantages. Adding a new product requires extending the abstract interface which implies that all of its derived concrete classes also must change.
Why do we need Abstract Factory?
The purpose of the Abstract Factory is to provide an interface for creating families of related objects, without specifying concrete classes. This pattern is found in the sheet metal stamping equipment used in the manufacture of Japanese automobiles.
Why is Factory Method good?
In the same way, using a Factory allows the consumer to create new objects without having to know the details of how they’re created, or what their dependencies are – they only have to give the information they actually want.
Why do we need factory class?
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 abstract factory pattern in Java?
What is factory design pattern?
A Factory Pattern or Factory Method Pattern says that just define an interface or abstract class for creating an object but let the subclasses decide which class to instantiate. In other words, subclasses are responsible to create the instance of the class.
Why do we need Abstract Factory pattern?
What is Abstract Factory pattern in Java?
Does factory pattern violates OCP?
No, it doesn’t violate the Open/Closed principle at all.