Java中用于映射haskell或在C＃中选择的等效方法是什么？

Question

Is there any built-in function in Java similar either to the map function in Haskell or Schema or to the Select extensor method in C#? I just want to write this kind of code in a shorter way:

List<String> names = new ArrayList<String>();
foreach (User element : getUsers()) {
   names.add(element.getName());
};
return names; 

a shorter way (in C#)

List<String> names = getUsers().Select(x => x.getName()).ToList();

I also need a way of pass function as parameter in a "friendly" way.

Answer 1

In Java 8, this would look something like

import static java.util.stream.Collectors.toList;

List<String> names = getUsers().stream().map(User::getName).collect(toList());

Answer 2

在Java 8中使用流，您可以执行以下操作：

List<String> names = getUsers().stream().map(User::getName).collect(Collectors.toList())