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Factory Pattern

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


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