Removing from a list inside for-each

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<String> names = new ArrayList<>(List.of("a", "b", "c", "d"));
        for (String s : names) {
            System.out.println(s);
            if (s.equals("a")) {
                names.remove(s);
            }
        }
        System.out.println(names);
    }
}