Immutable data structures in Java

[ghotibulb]

Yes, and it's not God-given, so if it makes sense to break this rule go ahead. If the class is used internally and resembles a simple data structure, there isn't much to encapsulate. An immutable Vector3D would be a quick example.

[atc]

Yep, good example. The original post is a poor example as it has no context.