How can I call a method on each element of a List?

Question

Suppose that I have a list of cars :

public class Car {
    private String brand;
    private String name;
    private String color;

    public Car() { // .         


        

Answer 1

Java 8 will (hopefully) have some form of lambda expression, which will make code like this more feasible. (Whether there'll be anything like list comprehensions is another matter.)

Your wish has been granted!

---EDIT---
lol as if on cue: forEach()

Definitely check this out.

For your question specifically, it becomes the folowing:

// Suppose that I have already init the list of car
List cars = //...
List names = new ArrayList();

// LAMBDA EXPRESSION
cars.forEach( (car) -> names.add(car.getName()) );

It's really quite incredible what they've done here. I'm excited to see this used in the future.

---EDIT---
I should have seen this sooner but I can't resist but to post about it.

The Stream functionality added in jdk8 allows for the map method.

// Suppose that I have already init the list of car
List cars = //...

// LAMBDA EXPRESSION
List names = cars.stream().map( car -> car.getName() ).collect( Collectors.toList() );

Even more concise would be to use Java 8's method references (oracle doc).

List names = cars.stream().map( Car::getName ).collect( Collectors.toList() );