Immutability

Using immutable types has a number of benefits. Since it eliminates mutation, it makes code easier to reason about. Also, it eliminates concurrent modification problems, thereby unlocking a lot of performance improvement opportunities. Java originally was fully Object-Oriented but it adapted to other paradigms. The language itself still lacks some features that makes it convenient to work with immutable data. In this post I’d like to show what can currently be done in vanilla Java and show a powerful concept to transform immutable data.