জাভা callable ফাংশন

public class Main {
  static String message(String text) {
    return text;
  }

  static void call(
    java.util.function.Function<String, String>
    callback
  ) {
    System.out.println(
      callback.apply("হ্যালো বিশ্ব")
    );
  }

  public static void main(String[] args) {
    call(Main::message);
  }
}