Factory Pattern

Factory Pattern: Defines an interface for creating an object, but let subclasses decide which class to instantiate. Factory method lets a class defer instantiation to the subclasses.

Example

Account.java

package com.factorypattern.example;

public abstract class Account {

 public void deposit() {
  System.out.println("Now you can deposit  Amount into your Account");
 }

 public void withdraw() {
  System.out.println("Now you can Withdraw Amount into your Account");
 }

 public abstract String getAccountType();
}

SavingsAccount.java

package com.factorypattern.example;

public class SavingsAccount extends Account {

 @Override
 public String getAccountType() {
  return "Saving Account";
 }
 
}

CheckingAccount.java

package com.factorypattern.example;

public class CheckingAccount extends Account {

 @Override
 public String getAccountType() {
  return "Checking Account";
 }
 
}

LoanAccount.java

package com.factorypattern.example;

public class LoanAccount extends Account{

 @Override
 public String getAccountType() {
  return "Loan Account";
 }

}

SimpleAccountFactory.java

package com.factorypattern.example;

public class SimpleAccountFactory {

 public Account openAccount(String type) {
  Account account = null;
  if (type.equals("saving")) {
   account = new SavingsAccount();
  } else if (type.equals("checking")) {
   account = new CheckingAccount();
  } else if (type.equals("loan")) {
   account = new LoanAccount();
  }
  return account;
 }
}

Bank.java

package com.factorypattern.example;

public class Bank {

 SimpleAccountFactory accountFactory;

 public Bank(SimpleAccountFactory accountFactory) {
  super();
  this.accountFactory = accountFactory;
 }

 public void openAccount(String type) {
  Account account = accountFactory.openAccount(type);
  System.out.format("Account Type: %s Opened successfully \n",account.getAccountType());
  account.deposit();
 }

}

AccountTestDrive.java

package com.factorypattern.example;

public class AccountTestDrive {
 public static void main(String[] args) {
  SimpleAccountFactory accountFactory = new SimpleAccountFactory();
  Bank bank = new Bank(accountFactory);
  bank.openAccount("saving");
 }
}

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