Can you collect(joining()) without mapping to string?

Question

I am reading java 8 in action, and the author says that if you have a class that overrides the toString method, you don\'t need to map the stream to Strings when doing colle

Answer 1

Whatever the book says is wrong and your interpretation is right (unless the point is entirely different and you did not get it)

people.stream()

will generate a Stream<People>, while Collectors.joining has a definition of:

public static Collector<CharSequence, ?, String> joining()

obviously this can't work as Person is not an instance of CharSequence.