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I’m yet to see a former Java developer who uses the idioms of the language they currently use. They all just write Java in a different language.

That is a function of the developer, not of the language, i.e. f(dev), not f(lang) ;)

Replace Java with star and that statement still holds true (for some people).

Hence the statement that you can write FORTRAN in any language.

This isn’t anything special about Java. A determined programmer can write Fortran in any language.