Enums in Java

From the Java cheat sheet · Enums · verified Jul 2026

Simple constants and enums with fields and methods.

java

// Quick Reference
enum Day { MON, TUE, WED }
Day d = Day.MON;
switch (d) { case MON -> ...; }

💡 Enums are type-safe - the compiler rejects any value outside the defined set.

⚡ Enum constructors are implicitly private and run once per constant.

📌 values() returns all constants; valueOf(name) parses one (throws if not found).

🟢 Give enums fields and methods to attach data and behavior to each constant.

enumsconstants