stream map method

Function interfaceを渡す
return type is Stream<R>

public class Outer {
    public static void main(String[] args) {
        List<Integer> l = List.of(1,2,3,4,5);
        l.stream().<String>map(a -> String.valueOf(a) + "xxx").forEach(System.out::println);
    }
}

1xxx
2xxx
3xxx
4xxx
5xxx