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Ilkka Seppälä committed 2026-06-07 19:32:28 +03:00
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immutable/README.md
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@@ -33,10 +33,6 @@ Wikipedia says
> In object-oriented and functional programming, an immutable object (unchangeable object) is an object whose state cannot be modified after it is created. This is in contrast to a mutable object (changeable object), which can be modified after it is created.
Class diagram
![Immutable class diagram](./etc/immutable.urm.puml)
## Programmatic Example of Immutable Pattern in Java
The core of the pattern is `ImmutableUser`. All fields are `final`, the mutable `roles` list is defensively copied via `List.copyOf`, and "mutation" is expressed by returning a new instance.