Re-learning Java Design Patterns

Re-learning Java Design Patterns is a Java design-pattern learning project based on the book Relearning Java Design Patterns. Instead of presenting design patterns as abstract theory, it teaches them through practical internet business scenarios. The repository includes examples drawn from transactions, marketing, flash-sale systems, middleware, source-code analysis, and other real development contexts. Its goal is to show how design patterns solve concrete engineering problems rather than simply naming pattern structures. The project is useful for Java developers who want to improve architecture thinking, code extensibility, and implementation discipline. It also serves as a companion codebase for readers who want to study each pattern through runnable Java examples.