LuTiao Programming

Apr 22, 2026 · Fundamentals

Stop Memorizing Design Patterns: Modern Strategy Pattern with Java 21+ Sealed Interfaces and Pattern Matching

The article critiques the classic interface‑plus‑N‑implementations Strategy Pattern for causing class explosion, then demonstrates how Java 17’s sealed interfaces and records together with Java 21’s pattern‑matching switch provide a more concise, type‑safe, and maintainable modern implementation.