When factory methods are useful?
Factory classes are useful when you need a complicated process for constructing the object, when the construction need a dependency that you do not want for the actual class, when you need to construct different objects etc.
How do you implement 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 the purpose of a factory method?
Factory Method is a creational design pattern that provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.
How are factory methods used in class based programming?
Factory method 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. This is done by creating objects by calling a factory method—either specified in an interface
How does the factory method pattern solve the problem?
The Factory Method design pattern solves the problem by putting all the information related to the class that needs to be instantiated into an object and using them outside the framework, as you can see below
What are objects returned by the factory method?
Objects returned by a factory method are often referred to as products. Subclasses can alter the class of objects being returned by the factory method. At first glance, this change may look pointless: we just moved the constructor call from one part of the program to another.