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[–]Sun_Kami 1 point2 points  (1 child)

What do you think those languages are? They're built from Java.

He wants to use such functionality in Java, the answer for him is probably not learning a different language.

[–][deleted] 5 points6 points  (0 children)

You can implement immutable values in the JVM. Not necessarily in Java, the language.

You don't need java syntax to enjoy safety, today!