Design PatternBuilder Pattern for Objects with Many Parameters in Java
How to use Builder Pattern to create objects with many parameters in a readable, immutable way with validation—from manual implementation to Lombok @Builder and records.
Factory Method and Abstract Factory in Java
Distinguish between Factory Method and Abstract Factory with concrete examples, including runnable Java code and JUnit 5 tests to see clearly when to use which pattern.
How Observer Differs From Pub/Sub
Distinguish Observer pattern and Pub/Sub through coupling, sync/async, and concrete Java examples to choose the right model.
Strategy Pattern: Replace if-else with an Interface
Guide to applying Strategy Pattern in Java/Spring Boot to eliminate long if-else chains and make code easier to extend and test.