QuickBill

A desktop billing system written in Java — customers, products, users and bills over a layered architecture: DAO classes for persistence, a service layer for billing logic, and a separate UI layer.

Structure

src/dao/       BillDAO, CustomerDAO, ProductDAO, UserDAO — data access
src/model/     Bill, Customer, Product, User — domain objects
src/service/   BillingService — billing rules
src/database/  DBConnection, DatabaseInitializer — JDBC setup and schema
src/ui/        user interface
src/main/      entry point

Run

./run.sh

The database schema is created on first run by DatabaseInitializer.