Top Architecture Tech Stack

Oct 13, 2023 · Fundamentals

Java Singleton Pattern: Eager, Lazy, Double‑Check Locking, Holder, and Enum Implementations

This article explains several common Java singleton implementations—including lazy ("hungry"), eager, double‑checked locking, holder, and enum patterns—detailing their code, thread‑safety characteristics, performance trade‑offs, and pitfalls such as partial initialization and reflection attacks.