public class Java8Tester {

   final static String salutation = "Hello! ";

   public static void main(String args[]) {
      GreetingService greetService1 = message -> 
      System.out.println(salutation + message);
      greetService1.sayMessage("Mahesh");
   }

   interface GreetingService {
      void sayMessage(String message);
   }
}