LuTiao Programming

Sep 28, 2026 · Backend Development

Java Discount Allocation: Solving the 1-Cent Rounding Error in Partial Refunds

The article presents a Java solution for allocating order-level discounts to individual items using integer arithmetic and deterministic remainder distribution, ensuring accurate partial refunds by persisting per-unit prices, allocated discounts, and payable amounts at checkout, with database schema and concurrency considerations.