Calling a getter/setter data carrier a VO (Value Object) causes confusion. A Value Object is a classification by meaning and value equality, while a DTO is a classification by its role of transferring data. This article walks through both definitions, how Core J2EE Patterns spread the conflation in the Java/J2EE world, and a naming convention that keeps roles visible.
Continue ReadingWhy storing 0.1 in a Java double causes a rounding error in the 52-bit IEEE 754 fraction, two failures it caused (NEIS grading and the Patriot missile), and how to choose between BigDecimal, integer minor units, and libraries such as Java Money.
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