What is Factory Pattern explain with example?
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.
Where is Factory Pattern used in Java?
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 simple factory?
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.
Where you can apply Factory Pattern?
The Factory Method pattern is generally used in the following situations: A class cannot anticipate the type of objects it needs to create beforehand. A class requires its subclasses to specify the objects it creates. You want to localize the logic to instantiate a complex object.
What is Factory Method in Java?
Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes. Factory Method defines a method, which should be used for creating objects instead of direct constructor call ( new operator).
What are factory methods in Java?
Factory method is a creational design pattern which solves the problem of creating product objects without specifying their concrete classes. The Factory Method defines a method, which should be used for creating objects instead of using a direct constructor call ( new operator).
Why is Factory Pattern used?
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.
Is constructor a factory?
A constructor is concrete in that it creates objects as instances of a single class, and by a specified process (class instantiation), while a factory can create objects by instantiating various classes, or by using other allocation schemes such as an object pool.
What is a factory used for?
A factory, manufacturing plant or a production plant is an industrial facility, often a complex consisting of several buildings filled with machinery, where workers manufacture items or operate machines which process each item into another.
What is factory simple?
Definition of factory 1 : a station where factors reside and trade a colonial factory. 2a : a building or set of buildings with facilities for manufacturing. b : the seat of some kind of production the vice factories of the slums.
Why is it called a factory?
A factory began as a word as a wholesale goods warehouse run by an owner or hired manager called a “factor.” Places where stuff was made with specific tools and complex processes go back to stone toolmaking, leather tanneries, potters, stone quarries, grain milling, etc.. had other names specific to the work or “ …
How does a factory work?