Abstract Factory Pattern

Abstract Factory Pattern: provides an interface for creating families of related or dependent objects without specifying concrete classes.

Example

Account.java

package com.abstractfactorypattern.example;

public interface Account {
 //define generic methods required
}

SavingsAccount.java

package com.abstractfactorypattern.example;

public class SavingsAccount implements Account {
 
 public String toString() {
  return "Savings Account created Succesfully";
 }
 
}

CheckingAccount.java

package com.abstractfactorypattern.example;

public class CheckingAccount implements Account {

 public String toString() {
  return "Checking Account created Succesfully";
 }

} 

LoanAccount.java

package com.abstractfactorypattern.example;

public class LoanAccount implements Account {

 public String toString() {
  return "Loan Account created Succesfully";
 }

} 

AbstractAccountFactory.java

package com.abstractfactorypattern.example;

public abstract class AbstractAccountFactory {
 public abstract Account createSavingsAccount();
 public abstract Account createCheckingAccount();
 public abstract Account createLoanAccount();
 
}

AccountFactory.java

package com.abstractfactorypattern.example;

public class AccountFactory extends AbstractAccountFactory {
 
 public Account createSavingsAccount(){
  return new SavingsAccount();
 }
 public Account createCheckingAccount(){
  return new CheckingAccount();
 }
 public Account createLoanAccount(){
  return new LoanAccount();
 }
 
}

AccountTestDrive.java

package com.abstractfactorypattern.example;

import java.util.ArrayList;
import java.util.List;

public class AccountTestDrive {
 
 public static void main(String[] args) {
  List accountList= new ArrayList<>();
  //AbstractAccount defines Account Factories
  AbstractAccountFactory accountFactory = new AccountFactory();
  //Using Factory to get Account instance
  Account savingsAccount = accountFactory.createSavingsAccount();
  Account checkingAccount = accountFactory.createCheckingAccount();
  Account loanAccount = accountFactory.createLoanAccount();
  accountList.add(savingsAccount);
  accountList.add(checkingAccount);
  accountList.add(loanAccount);
  
  for (Account account : accountList) {
   System.out.println(account);
  }
  
 }
}

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