← Exit to Module 13: Enums and Annotations lessons
Module progress · 0%Lesson · 30 min
Module 13: Enums and Annotations
Lesson focusMini-Project: Enum-Powered State Machine
Model ticket lifecycle states with enums, transitions, and annotations for validation.
01 · 12 minEnum FundamentalsLocked02 · 15 minAdvanced Enum TechniquesLocked03 · 14 minBuilt-in AnnotationsLocked04 · 18 minCreating Custom AnnotationsLocked05 · 30 minMini-Project: Enum-Powered State MachineLocked
Define an enum TicketState with allowed transitions stored as EnumSet per constant.
Annotate service methods with custom @RequiresState to enforce preconditions via reflection or AOP.
Implement command objects that move tickets through states, logging transitions and preventing invalid moves.