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 is a concrete creator?
Concrete Creator – implements or overrides the factory method to return a Concrete Product.
What is the difference between abstract factory and factory method design pattern?
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. The Factory Method pattern uses inheritance and relies on a subclass to handle the desired object instantiation.
What are the advantages of factory method?
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 the use of factory method?
The Factory Method pattern is a design pattern used to define a runtime interface for creating an object. It’s called a factory because it creates various types of objects without necessarily knowing what kind of object it creates or how to create it.
How do you create a factory method?
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.
What is a factory in coding?
In object-oriented programming (OOP), a factory is an object for creating other objects – formally a factory is a function or method that returns objects of a varying prototype or class from some method call, which is assumed to be “new”.
What are creator methods?
A creator is a method that creates (and returns) an object. That function could use a new-expression, thus creating an object, and return it. Note that a constructor is not a creator. Evaluation of a new- expression creates an object; all a constructor does is initialize fields.
What is the difference between simple factory and factory method?
– A Simple factory is normally called by the client via a static method, and returns one of several objects that all inherit/implement the same parent. – The Factory Method design is really all about a “create” method that is implemented by sub classes. It normally uses the Factory Method to create the objects.
What is a facade programming?
From Wikipedia, the free encyclopedia. The facade pattern (also spelled façade) is a software-design pattern commonly used in object-oriented programming. Analogous to a facade in architecture, a facade is an object that serves as a front-facing interface masking more complex underlying or structural code.