Java8 Add Numbers

@FunctionalInterface
interface AddNumbers{
public int addNumbers(int x, int y);
}

public class Java8AddNumbers {

public static void main(String[] args) {
AddNumbers addNumbers = (x, y) -> x+y;

int result = addNumbers.addNumbers(10, 30);
System.out.println(result);

}

}

Java8 Print Hello

public class Java8PrintHello {

public static void main(String[] args) {
SayHello wish = name -> "Hello "+name;
System.out.println(wish.sayHello("Sai Kumar"));
}

}

@FunctionalInterface
interface SayHello{
public String sayHello(String name);
}