Factory Pattern

       Factory Pattern is way to create object in such Way using Common Interface without exposing the creation logic

Simple Example

     

Example:

step  1.  creation of interface.

    public interface BANK {   

    double getIntrest();

  }

step  2.

 implementation of interface for BOB.

public class BOB implements BANK {

    @Override

    public double getIntrest() {

        return 8.7;

    }

}

step 3.

 implementation of interface for SBI

.

public class SBI implements BANK{

    @Override

    public double getIntrest() {

        return 5.7;

    }

    

}

step 4.

 implementation of interface for UNION  .

public class UNION  implements BANK{

    @Override

    public double getIntrest() {

        return  10.2;

    }

    

}

step 5.

class Imp to get Factory Based on input from user.

public class Factory {

    public BANK getBank(String bankName) {

        switch (bankName) {

            case "SBI":

                return new SBI();

            case "BOB":

                return new BOB();

            case "UNION":

                return new UNION();

        }

        return null;

    }

}

step 6.

public class BankTest {

  

    public static void main(String[] args) {

       Factory ff=new Factory();

        BANK bank = ff.getBank("SBI");

        double intrest = bank.getIntrest();

        System.out.println("Interest is:"+intrest);

               

    }

    

}

Result:

Interest is:5.7