Contents
- 1 When should you use factory design pattern?
- 2 What’s the purpose of using factory creational pattern?
- 3 What is the difference between factory and abstract factory pattern?
- 4 What is difference between Factory Method and prototype design pattern?
- 5 How does the factory design pattern refer to the client?
- 6 When to use factory methods in a Petter?
- 7 What was the first design pattern I ever used?
When should you use factory design pattern?
It is good idea to use factory methods inside object when:
- Object’s class doesn’t know what exact sub-classes it have to create.
- Object’s class is designed so that objects it creates were specified by sub-classes.
What’s the purpose of using factory creational pattern?
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.
Where do we use factory design 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 the difference between factory and abstract factory 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 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.
What is difference between Factory Method and prototype design pattern?
Factory pattern is used to introduce loose coupling between objects as the factory will take care of all the instantiation logic hiding it from the clients. Prototype pattern on the other hand is used when the cost of creating an object is large and it is ok to copy an existing instance than creating a new instance.
Does prototype require subclassing?
Prototype doesn’t require subclassing, but it does require an “initialize” operation. Factory Method requires subclassing, but doesn’t require Initialize. Designs that make heavy use of the Composite and Decorator patterns often can benefit from Prototype as well.
How does the factory design pattern refer to the client?
The responsibility of creating the instance is delegated to the sub-class methods. So the name Factory Method Pattern. The client refers to the abstract creator class but uses one of the sub-classes to get the actual instance. In the preceding, abstract method M () creates the actual instance and returns the reference to the client.
When to use factory methods in a Petter?
The factory petter uses polymorphism, dependency injection and Inversion of control. The stated purpose of the Factory Patterns is: Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.
When do you need to use factory methods?
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.
What was the first design pattern I ever used?
The Builder pattern is not only a great pattern for creating complicated objects, it supports your application’s further evolution. The first design pattern I ever used was the Factory Method pattern.