Lambda : Method Reference :: Expression

public class Greeter {

       public void greet(){

              System.out.println("Hello World!");

       }

}

public class ConcurrenceGreeter extends Greeter {

       @Override

       public void greet() {

              Thread thread = new Thread(super::greet);

              thread.start();

       }

       public static void main(String[] args) {

              Greeter greeter = new ConcurrenceGreeter();

              greeter.greet();

       }

}

Output:

Hello World!