Java Stream - 如何map为每个元素添加String值

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Main {

  public static void main(String[] args) {
    List<String> _names = Arrays.asList("Bob", "Tom", "Jeff", "Scott",
        "Jennifer", "Steve");

    List<String> greetings = _names.stream().map(name -> "Hello " + name)
        .collect(Collectors.toList());
    System.out.println(greetings);

  }
}