In Mutable and Immutable Objects, David O’Meara specifies that there are two approaches for ensuring methods are not overridden in a class designed to be immutable.

Mutable class with a convert-to-immutable-version method The previous pattern is suitable for read-only data whose usage is short-lived (e.g., scoped to a method).

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Java SE 14 (March 2020) introduces records (jep359) as a preview feature. Records aim to enhance the language's ability to model "plain data" aggregates with less ceremony. In this article Java ...

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For that to be possible, either you had to cast from mutable to immutable (which you shouldn't have) or the mutable string derives from the immutable string (which it shouldn't have).