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Abstract Factory Pattern

Abstract Factory Pattern says that just define an interface or abstract class for creating families of related (or dependent) objects but without specifying their concrete sub-classes.That means Abstract Factory lets a class returns a factory of classes. So, this is the reason that Abstract Factory Pattern is one level higher than the Factory Pattern.

An Abstract Factory Pattern is also known as Kit.

Advantage of Abstract Factory Pattern

  • Abstract Factory Pattern isolates the client code from concrete (implementation) classes.
  • It eases the exchanging of object families.
  • It promotes consistency among objects.

Usage of Abstract Factory Pattern

  • When the system needs to be independent of how its object are created, composed, and represented.
  • When the family of related objects has to be used together, then this constraint needs to be enforced.
  • When you want to provide a library of objects that does not show implementations and only reveals interfaces.
  • When the system needs to be configured with one of a multiple family of objects.

UML for Abstract Factory Pattern

  • We are going to create a Bank interface and a Loan abstract class as well as their sub-classes.
  • Then we will create AbstractFactory class as next step.
  • Then after we will create concrete classes, BankFactory, and LoanFactory that will extends AbstractFactory class
  • After that, AbstractFactoryPatternExample class uses the FactoryCreator to get an object of AbstractFactory class.
  • See the diagram carefully which is given below:
abstract factory pattern

Example of Abstract Factory Pattern

Here, we are calculating the loan payment for different banks like HDFC, ICICI, SBI etc.

Step 1: Create a Bank interface

Step 2: Create concrete classes that implement the Bank interface.

Step 3: Create the Loan abstract class.

Step 4: Create concrete classes that extend the Loan abstract class..

Step 5: Create an abstract class (i.e AbstractFactory) to get the factories for Bank and Loan Objects.

Step 6: Create the factory classes that inherit AbstractFactory class to generate the object of concrete class based on given information.

Step 7: Create a FactoryCreator class to get the factories by passing an information such as Bank or Loan.

Step 8: Use the FactoryCreator to get AbstractFactory in order to get factories of concrete classes by passing an information such as type.



Output

abstract factory pattern output



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