Java Tech Workshop

May 18, 2026 · Fundamentals

Understanding Compile-Time and Run-Time Constants in Java

This article explains the fundamental differences between compile-time and run-time constants in Java, covering their definitions, required modifiers, allowed data types, initialization rules, JVM storage behavior, class‑initialization effects, constant‑folding optimizations, practical code examples, common pitfalls, and guidelines for choosing the appropriate constant type in production code.