Java 8:Lambda Expression Hello World Example.

We have written a simple HelloWorldLambdas class to illustrate the usage of 

lambda Expression.

We have declared an interface Greeting with a single abstract method sayHello. 

A testGreetingmethod with  parameters as String and Greeting . 

From the main class we instantiate the HelloWorldLambdas class

to invoke the test Greeting with lambda expression.

package com.consciousprogramming.LambdaExpressions.examples;

public class HelloWorldLambdas {

    interface Greeting{
        String sayHello(String greeting);
    }

    public void testGreeting(String input, Greeting greeting){
        String result= greeting.sayHello(input);
        System.out.println(result);
    }
    public static void main(String [] args){
        new HelloWorldLambdas().testGreeting("World",(s)->"Hello "+s);
        new HelloWorldLambdas().testGreeting("",(s)->s.isEmpty()?"Input not provided":"Hello"+s);

    }
}