Why list of String has no forEach method?

Dawid :

I have problem with understand why String[] args variable has no forEach method? I can not find any information that this type is not Serializable or Collection because forEach methos implements Serializable.

For example, I have simple main Java class. If I want to use forEach method, I have to first import Arrays class and then on stream use forEach method like below:

import java.util.Arrays;

public class MyClass {
  public static void main(String[] args) {
    Arrays.stream(args).forEach(System.out::println);
  }
}

Why it is not possible to make it just simple like this?

args.forEach(System.out::println);

cameron1024 :

Short answer: Arrays don't have a forEach method defined on them.

Longer answer: Because it doesn't need it. An array type (using [], not List<>) represents a low level structure in memory, more suited to low level optimisations rather than higher level functional-style code. The hardware of a machine much more closely resembles the imperative, stateful style from languages like C, rather than the functional stateless style from languages like Haskell. Because of this, when creating a lower level data structure like a basic array, it doesn't necessarily make sense to give it more advanced functionality. If you really want a forEach() method, trivially wrap it using Arrays.asList(), Arrays.stream(), or List.of() (depending on Java version).