Functional Programming in Java, Second Edition: p.47 "IterateString.java" can be simplified

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On page 47, we find the code for compare/fpij/IterateString.java

str.chars()
   .mapToObj(ch -> Character.valueOf((char)ch))
   .forEach(System.out::println);

This can be further simplified as per IDE suggestion:

str.chars()
   .mapToObj(ch -> (char) ch)
   .forEach(System.out::println);

because autoboxing takes care of creating the Character instances.

We are left with .mapToObj(ch -> (char) ch) which apparently does nothing (but it does, allocating Character). It is practically is a compiler instruction to switch types.