Gym Manager

Gym Manager is a desktop gym management system built with Java Swing, structured around a clean MVC architecture with full CRUD operations across every entity. The Model layer owns data and validation, the Service layer owns business logic, the View layer is the Swing UI, and the Controller layer orchestrates between them, leaving no business logic in the UI and keeping every layer independently testable.

Member lifecycle management covers adding Regular or Premium members, tracking attendance with loyalty points awarded per visit (+5 for a regular visit, +10 for a milestone visit), and upgrading Regular members through a Basic, Standard, Deluxe progression once they have logged 30 visits and paid in full.

The payment system records partial or full payments, automatically applies a 10% discount for Premium members paying in full, and stores all currency as long paisa values to avoid floating-point rounding bugs. Removed members are not hard-deleted; a soft-delete-with-restoration model keeps their historical attendance, loyalty, and payment data intact and restorable, and CSV save/load preserves the complete member state across sessions.

The UI uses the Nimbus look-and-feel, a menu bar with an Actions dropdown, a filterable member table (Active, Removed, All), and an About dialog with a built-in usage guide.