জাভা variable ফাংশন

public class Main {
  static String message() {
    return "হ্যালো বিশ্ব";
  }

  public static void main(String[] args) {

    java.util.function.Supplier<String>
      function = Main::message;

    System.out.println(
      function.get()
    );
  }
}