Difference between Dependency Injection and Factory Pattern.

Question

Difference between Dependency Injection and Factory Pattern.

SpringObject Oriented ProgrammingProgramming

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Factory and Dependency injection both are the design pattern which can be used to enhance loose coupling abilities between the software components. 

Factory design pattern is used to create objects. But, injection and life cycle management of the object should be handled by programmer within the application. There is no way to configure everything in a single place. Therefore, programmers need to call object creation logic wherever it needed which eventually hinder the loose coupling abilities.

In DI design pattern, creation of object, injecting of the instance and life cycle management of the instance can be handled outside the code. In spring, Instantiation ,Injection and Lifecycle management are handled by IOC container.

Sr. No.	Key	Factory design pattern	DI design pattern
1	Object Creation	It is used to create objects. We have separate Factory class which contains creation logic.	It is responsible for creation and injection of the object.
2	State Of the Object	It is responsible for creation of stateful objects.	It is responsible to create stateless objects
3	Runtime /Compile time	Create object at compile time	Configure objects at runtime
4	Code Change	In case of change in business requirements, object creation logic may be changed.	No code change required
5	M echanism	Class is dependent on factory method which in turn have dependency on concrete classes	Parent object and all dependent object can be created at single location

Example of Factory pattern

static class PizzaFactory{
   public Pizza buildPizza(String pizzaType){
      ........

      Pizza pizza= //create pizza based on type
      return pizza;
   }
}
static void Main(){
   Pizza pizza = PizzaFactory.buildPizza("Greek style");
}

Example of Dependency Injection

public class CustomerExample {
   public Address address
   public CustomerExample(Address address) {
      this.address = address;
   }
}
public class Address {
   ..............
}

Himanshu shriv

Published on 09-Sep-2020 12:22:05

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