Take an attribute from a list of pojo class to an array of that attribute

Question

Suppose for one field/attribute in a pojo class , i need to create a list of that field's value alone. Its doable in java using iteration . But is there any custom library for doing this ? For eg :

public class User
{
  private String name;
  private Integer age;
  // setters and getters. 
}

What i want is , List<User> ---> List<String> , here the values are of field "name".

Answer 1

In Java 8 you can create a stream from the list and apply a mapping function to map it to a list of names:

List<User> users;
List<String> names = users.stream().map(user -> user.getName()).collect(Collectors.toList());