What is a simple factory pattern?
Simple factory pattern describes a class that has one creation method with a large conditional that based on method parameters chooses which product class to instantiate and then return. People usually confuse simple factories with a general factories or with one of the creational design patterns.
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.
How is an abstract factory different from a factory method?
The main difference between a “factory method” and an “abstract factory” is that the factory method is a single method, and an abstract factory is an object.
Why do we say that factory method is implemented by inheritance?
In other words, the client is a subclass whose parent defines the factoryMethod (). This is why we say that Factory Method is implemented by Inheritance. The second critical point is to remember that the Factory Method Pattern is nothing more than a specialization of the Template Method Pattern. The two patterns share an identical structure.
Which is an example of a factory pattern?
A famous third example is Josh Bloch’s Static Factory Pattern from Effective Java. The Head First Design Patterns book includes yet another pattern they call Simple Factory. Don’t fall into the trap of assuming every Factory pattern must match one from the GoF.
Which is an example of an abstract product?
Abstract Products declare interfaces for a set of distinct but related products which make up a product family. Concrete Products are various implementations of abstract products, grouped by variants. Each abstract product (chair/sofa) must be implemented in all given variants (Victorian/Modern).