Showing Posts From
System Design
Jason Yang · 13 May, 2026
The Liskov Substitution Principle in Java: why the classic Rectangle/Square example violates LSP, and how smaller interfaces or composition fix the design.
System Design
Jason Yang · 13 May, 2026
Apply the Open-Closed Principle in Java with the Strategy Pattern — add new behavior without editing core logic, shown with a payment-processing example.
System Design
Jason Yang · 13 May, 2026
DIP vs DI in Java: they work together but differ — DIP keeps logic depending on abstractions, DI supplies dependencies from outside. Explained with examples.
System Design
Jason Yang · 12 May, 2026
SOLID principles in Java explained with simple examples — SRP, OCP, LSP, ISP, and DIP, each with backend-focused code. The full series index starts here.
System Design
Jason Yang · 12 May, 2026
Dependency Inversion Principle in Java, explained with notification, payment gateway, Spring Boot, and testing examples.
System Design
Jason Yang · 12 May, 2026
The Interface Segregation Principle in Java: why one fat interface forces empty methods and UnsupportedOperationException, and how small focused interfaces fix it — with phone, printer, and backend examples.
System Design
Jason Yang · 12 May, 2026
The Liskov Substitution Principle in Java: why a subclass that breaks its parent's contract violates LSP, shown with bird, Flyable, and discount policy examples.
System Design
Jason Yang · 12 May, 2026
The Open-Closed Principle in Java: add new behavior without touching stable code, shown with payment methods, interfaces, and Spring Boot style examples.
System Design
Jason Yang · 12 May, 2026
The Single Responsibility Principle in Java: what 'one reason to change' actually means in practice, with backend service and Spring Boot style examples.
