Collectors.toMap() keyMapper function question

[pfurbacher]

I'm wondering how to more succinctly express the "keyMapper" function which
is highlighted in the following:

       List<Person> roster = ...;

       Map<String, Person> map = 
            roster
                .stream()
                .collect(
                    Collectors.toMap(
                       *new Function<Person, String>() { 
                            public String apply(Person p) { return
p.getLast(); } 
                         }*,
                        Function.<Person>identity()));

Thanks.





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