Java8

/**

 *@Author : rohit

 *5th-Feb-2019

 * */

public class HelloJ7{

        public void display(String msg){

                System.out.println(msg);

        }

        public static void main(String [] args){

                HelloJ7 p = new HelloJ7();

                p.display("Hello World.");

        }

}

/**

 *@Author : rohit

 *5th-Feb-2019

 * */

public class HelloJ8V1{

        //is functional interface and must have only one method declared.

        @FunctionalInterface 

        interface Printer {

                void display(String x);

        }       

        public static void main(String [] args){

                Printer p = b -> System.out.println(b);

                p.display("Hello from printer.");

        }

}

/**

 *@Author : rohit

 *5th-Feb-2019

 * */

//Abstract Functional Interface 

import java.util.function.Consumer;

public class HelloJ8V2{

        public static void main(String [] args){

                Consumer<String> x = b -> System.out.println(b);

                x.accept("Hello from consumer.");

        }

}