What is the Java equivalent for Enumerable.Select with lambdas in C#?

Question

Say I have an object in C#:

public class Person {     public string Name{get;set;}     public int Age{get;set;} } 

To select the names from this list in C# I would do the following:

List<string> names = person.Select(x=>x.Name).ToList(); 

How would I do the same thing in Java 8?

Answer 1

If you have a list of Persons like List<Person> persons; you can say

List<String> names   =persons.stream().map(x->x.getName()).collect(Collectors.toList()); 

or, alternatively

List<String> names   =persons.stream().map(Person::getName).collect(Collectors.toList()); 

But collecting into a List or other Collection is intented to be used with legacy APIs only where you need such a Collection. Otherwise you would proceed using the stream’s operations as you can do everything you could do with a Collection and a lot more without the need for an intermediate storage of the Strings, e.g.

persons.stream().map(Person::getName).forEach(System.out::println);