??

????? ???, ?? ??? ??? ?? ?? ???? ?? ?? ?? ??? ???? ?? ? ?? ?? ????. ??? ?? ???????? ?? ???? ??? ??? ??? ??? ??(Factory Method Pattern)? ???????. ? ?? ??? ??? ??? ??? ????? ??? ???? ?????????.

??? ??? ??? ??????? ??? ???? ?? ?????? ?????, ??? ??? ??? ?? ????? ??? ? ??? ?????.

??

?? ??????? ?? ?? ??, ??? ?? ? ??? ??? ?? ??? ???? ??? ???? ??? ??? ?????.

??? ??? ??? ???? ?? ??? ??? ??? ?? ????? ???????.

Java? ??? ?? ???????.

??: Person1? ?? ??(?? ?? ?? PayPal ??)? ???? Person2?? ?? ????.

?? ??:

problem/
├─ BankApp.java
├─ service/
│  ├─ PaypalTransferPayment.java
│  ├─ BankTransferPayment.java
├─ data/
│  ├─ Person.java

?? ???????? ?????? 2?? ?????.

package problem;

import problem.data.Person;

public class BankApp {
    public static void main(String[] args) {
        Person person1 = new Person("John", 1000);
        Person person2 = new Person("Jane", 500);
    }
}

BankTransferPayment ? PaypalTransferPayment ???? ?????.

package problem.service;

import problem.data.Person;

public class BankTransferPayment {
    public void processPayment(Person fromAccount, Person toAccount, float amount) {
        fromAccount.withdraw(amount);
        toAccount.deposit(amount);
        System.out.println("Bank transfer payment success.");
    }
}

package problem.service;

import problem.data.Person;

public class PaypalPayment {
    public void processPayment(Person fromAccount, Person toAccount, float amount) {
        fromAccount.withdraw(amount);
        toAccount.deposit(amount);
        System.out.println("Paypal transfer payment success.");
    }
}

?? ??? ??? ?????.

package problem;

import problem.data.Person;
import problem.service.BankTransferPayment;
import problem.service.PaypalPayment;

public class BankApp {
    public static void main(String[] args) {
        Person person1 = new Person("John", 1000);
        Person person2 = new Person("Jane", 500);

        String paymentMethod = "BANK_TRANSFER";

        if (paymentMethod.equals("BANK_TRANSFER")) {
            BankTransferPayment bankTransferPayment = new BankTransferPayment();
            bankTransferPayment.processPayment(person1, person2, 100);

            System.out.println("===Method bank_transfer===");
            System.out.println(person1.getName() + " has " + person1.getAmount());
            System.out.println(person2.getName() + " has " + person2.getAmount());
        } else if (paymentMethod.equals("PAYPAL")) {
            PaypalPayment paypalPayment = new PaypalPayment();
            paypalPayment.processPayment(person1, person2, 100);

            System.out.println("===Method paypal===");
            System.out.println(person1.getName() + " has " + person1.getAmount());
            System.out.println(person2.getName() + " has " + person2.getAmount());
        }
    }
}

?? ?? ??:

1. ?? ??: ?? ?? ??? ?? processPayment ??? ??? ?????.
2. ???? ??? ??: ??????? ?? ?? ?? ??? ???? ??? ?????? ??? ?????.
3. ??? ??: ??? ?? ??? ???? ?? ??? ?? ????? ?? ??? ??????.

???

? ??? ?? ???? ??? ??? ??? ???? ????. ?? ??? ??????

?? ???:

1. ? if-else ??? processPayment ???? ????? ???? ??? ?????.
2. ?? ?? ??? ?? ??? ????? ??? if-else ??? ??? ???????.

??? ??? ???? ?? Factory Method ??? ???? ????????.

?? ??(???):

solution/
├─ BankApp.java
├─ service/
│  ├─ payments/
│  │  ├─ Payment.java
│  │  ├─ PaymentFactory.java
│  │  ├─ BankTransferPayment.java
│  │  ├─ PaypalTransferPayment.java
├─ data/
│  ├─ Person.java

1??: ?? ????? ??, ?? ??? processPayment ??

package solution.service.payments;

import solution.data.Person;

// Step 1: Create an interface for the payment
public interface Payment {
    void processPayment(Person fromAccount, Person toAccount,float amount);
}

2??: BankTransferPayment ?? ? PaypalTransferPayment ???? ?? ?????? ?????.

package solution.service.payments;

import solution.data.Person;

// Step 2: Create a class that implements the Payment interface
public class BankTransferPayment implements Payment {
    @Override
    public void processPayment(Person fromAccount, Person toAccount, float amount) {
        fromAccount.withdraw(amount);
        toAccount.deposit(amount);
        System.out.println("Bank transfer payment success.");
    }
}

package solution.service.payments;

import solution.data.Person;

public class PaypalPayment implements Payment{
    @Override
    public void processPayment(Person fromAccount, Person toAccount, float amount) {
        fromAccount.withdraw(amount);
        toAccount.deposit(amount);
        System.out.println("Paypal transfer payment success.");
    }
}

3??: PaymentFactory ???? ?????. ?? ?? ??? ?? ?? ??? ???? ??????.

package solution.service.payments;

public class PaymentFactory {
    public Payment createPayment(String paymentType) {
        if (paymentType == null) {
            return null;
        }
        if (paymentType.equalsIgnoreCase("BANK_TRANSFER")) {
            return new BankTransferPayment();
        } else if (paymentType.equalsIgnoreCase("PAYPAL")) {
            return new PaypalPayment();
        }
        return null;
    }
}

4??: ?? ???????? ???? ?????.

Factory Method ??? ????? main ??? ?????.

problem/
├─ BankApp.java
├─ service/
│  ├─ PaypalTransferPayment.java
│  ├─ BankTransferPayment.java
├─ data/
│  ├─ Person.java

??? ??? ?? ??? ??

• ??? ? ???? ????????.
• ?? if-else ???? processPayment? ?? ?? ??? ?????.
• ?? ??? ??? ???? ?? ???? ?????.

???

PaymentFactory ???? ???/??? ??(SOLID ??)? ????? ??? ?? ??? ???? ?? ?? ????? ??? ? ????.

????? PaymentFactory.java:

package problem;

import problem.data.Person;

public class BankApp {
    public static void main(String[] args) {
        Person person1 = new Person("John", 1000);
        Person person2 = new Person("Jane", 500);
    }
}

?? ???????? ????? ???? ?????.

package problem.service;

import problem.data.Person;

public class BankTransferPayment {
    public void processPayment(Person fromAccount, Person toAccount, float amount) {
        fromAccount.withdraw(amount);
        toAccount.deposit(amount);
        System.out.println("Bank transfer payment success.");
    }
}

? ?? ??? ???? ??? ??/?? ??? ????? PaymentFactory ??? ???? ??? ??? ?? ??? ??? ? ????.

? ???? ???? ??? ???? ?????.

????:

??? ??? ??

? ??? ??? ??? ?? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!