Mastering SOLID Principles in Java: Code Examples, Diagrams & Interview Insights
Write maintainable, scalable, and testable enterprise Java with SRP, OCP, LSP, ISP, and DIP — backed by real-world banking/finance examples, refactorings, and accessible diagrams. Who is this for? Professional Java devs and interview candidates who want production-grade code quality and crisp explanations for system design/OO rounds. Contents Introduction Single Responsibility Principle (SRP) Open/Closed Principle (OCP) Liskov Substitution Principle (LSP) Interface Segregation Principle (ISP) Dependency Inversion Principle (DIP) How SOLID helps in interviews & real projects Practical tips for projects & interviews References & further learning Introduction SOLID is an acronym popularized by Robert C. Martin for five OO design principles. In enterprise Java, these guardrails reduce coupling, protect against regressions, and make code easier to extend an...