feat: Add practical real-world examples for Singleton, Builder, and S…

[gurioh]

…trategy patterns

Added comprehensive real-world examples with tests and documentation for three commonly used design patterns in enterprise applications.

Singleton Pattern

• ConfigurationManager: Application settings management
• LoggerService: Centralized logging system
• DatabaseConnectionPool: Connection pool management
• Full test coverage for all implementations
• Updated README with usage examples and Korean documentation

Builder Pattern

• UserDTO: Complex user data transfer object
• HttpRequest: HTTP request builder for API calls
• EmailMessage: Email composition with attachments
• Comprehensive tests for all builders
• Enhanced README with practical use cases

Strategy Pattern

• PaymentProcessor: Payment processing system
• CreditCardPayment: Credit card payment strategy
• BankTransferPayment: Bank transfer strategy
• PayPalPayment: PayPal integration strategy
• Complete test suite for payment strategies
• Updated README with e-commerce payment example

All examples include:

• Production-ready code with validation
• Comprehensive JUnit 5 tests
• Detailed Javadoc documentation
• Korean and English README sections
• Real-world use cases and best practices

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• 76ce920: feat: Add practical real-world examples for Singleton, Builder, and Strategy patterns

Added comprehensive real-world examples with tests and documentation for three
commonly used design patterns in enterprise applications.

Singleton Pattern

• ConfigurationManager: Application settings management
• LoggerService: Centralized logging system
• DatabaseConnectionPool: Connection pool management
• Full test coverage for all implementations
• Updated README with usage examples and Korean documentation

Builder Pattern

• UserDTO: Complex user data transfer object
• HttpRequest: HTTP request builder for API calls
• EmailMessage: Email composition with attachments
• Comprehensive tests for all builders
• Enhanced README with practical use cases

Strategy Pattern

• PaymentProcessor: Payment processing system
• CreditCardPayment: Credit card payment strategy
• BankTransferPayment: Bank transfer strategy
• PayPalPayment: PayPal integration strategy
• Complete test suite for payment strategies
• Updated README with e-commerce payment example

All examples include:

• Production-ready code with validation
• Comprehensive JUnit 5 tests
• Detailed Javadoc documentation
• Korean and English README sections
• Real-world use cases and best practices

📁 Files being considered (22)

🔄 builder/README.md (1 hunk)
➕ builder/src/main/java/com/iluwatar/builder/EmailMessage.java (1 hunk)
➕ builder/src/main/java/com/iluwatar/builder/HttpRequest.java (1 hunk)
➕ builder/src/main/java/com/iluwatar/builder/UserDTO.java (1 hunk)
➕ builder/src/test/java/com/iluwatar/builder/EmailMessageTest.java (1 hunk)
➕ builder/src/test/java/com/iluwatar/builder/HttpRequestTest.java (1 hunk)
➕ builder/src/test/java/com/iluwatar/builder/UserDTOTest.java (1 hunk)
🔄 singleton/README.md (1 hunk)
➕ singleton/src/main/java/com/iluwatar/singleton/ConfigurationManager.java (1 hunk)
➕ singleton/src/main/java/com/iluwatar/singleton/DatabaseConnectionPool.java (1 hunk)
➕ singleton/src/main/java/com/iluwatar/singleton/LoggerService.java (1 hunk)
➕ singleton/src/test/java/com/iluwatar/singleton/ConfigurationManagerTest.java (1 hunk)
➕ singleton/src/test/java/com/iluwatar/singleton/DatabaseConnectionPoolTest.java (1 hunk)
➕ singleton/src/test/java/com/iluwatar/singleton/LoggerServiceTest.java (1 hunk)
🔄 strategy/README.md (1 hunk)
➕ strategy/src/main/java/com/iluwatar/strategy/payment/BankTransferPayment.java (1 hunk)
➕ strategy/src/main/java/com/iluwatar/strategy/payment/CreditCardPayment.java (1 hunk)
➕ strategy/src/main/java/com/iluwatar/strategy/payment/PayPalPayment.java (1 hunk)
➕ strategy/src/main/java/com/iluwatar/strategy/payment/PaymentProcessor.java (1 hunk)
➕ strategy/src/main/java/com/iluwatar/strategy/payment/PaymentResult.java (1 hunk)
➕ strategy/src/main/java/com/iluwatar/strategy/payment/PaymentStrategy.java (1 hunk)
➕ strategy/src/test/java/com/iluwatar/strategy/payment/PaymentProcessorTest.java (1 hunk)

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