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

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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

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package com.factorypattern.example;   public class SavingsAccount extends Account {    @Override  public String getAccountType() {   return "Saving Account";  }    }

CheckingAccount.java

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package com.factorypattern.example;   public class CheckingAccount extends Account {    @Override  public String getAccountType() {   return "Checking Account";  }    }

LoanAccount.java

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package com.factorypattern.example;   public class LoanAccount extends Account{    @Override  public String getAccountType() {   return "Loan Account";  }   }

SimpleAccountFactory.java

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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

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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

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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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