CODEWITHSUNDEEP
javajava-8
nimo23
nimo23

Reputation: 5700

functional method vs normal method in class

What is the difference of using function method (closure) and normal java method when not using this functional method within a method itself. Any other benefits (e.g. faster access speed)?

version 1:

public class Test{

    // does not need to be consumer, can also be 
    // own function (see version 3)
    public static final Consumer<User> addUser = s -> {
        // the same logic as in version 2
    };
}

version 2:

public class Test{
    public static final void addUser(User u) {
        // the same logic as in version 1
    }
}

version 3:

public class Test{

Function<User, String> addUser= (User e)-> {/* the same logic as in version 2 */;return "saved";};
}

Upvotes: 2

Views: 153

Answers (1)

Eugene
Eugene

Reputation: 120938

The first time you invoke your Consumer it will be slower, because your lambda expression will spin a class underneath that will implement Consumer::accept with the logic that you provided, but that happens only once on the first call.

You can pass around a Consumer for example, but you can't a method. Well, there are MethodHandles that allow to pass a pointer/reference to a method.

Upvotes: 4

Related Questions