Auto Value

https://github.com/google/auto/blob/master/value/userguide/index.md

Value classes are extremely common in Java projects. These are classes for which you want to treat any two instances with suitably equal field values as interchangeable. That's right: we're talking about those classes where you wind up implementingequals,hashCodeandtoStringin a bloated, repetitive, formulaic yet error-prone fashion.

Writing these methods the first time is not too bad, with the aid of a few helper methods and IDE templates. But once written they continue to burden reviewers, editors and future readers. Their wide expanses of boilerplate sharply decrease the signal-to-noise ratio of your code... and they love to harbor hard-to-spot bugs.

AutoValue provides an easier way to create immutable value classes, with a lot less code and less room for error, whilenot restricting your freedomto code almost any aspect of your class exactly the way you want it.

This page will walk you through how to use AutoValue. Looking for a little more persuasion? Please seeWhy AutoValue?.