Lambda expression in java [How to implement the Functional interface - GreetingService]

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LambdaDemo.java

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

public class LambdaDemo
{

    public static void main(String[] args)
    {

        // with parenthesis
        GreetingService greetService1 = message ->
                          System.out.println("Hello " + message);

        // without parenthesis
        GreetingService greetService2 = (message) -> 
                          System.out.println("Hello " + message);

        greetService1.sayMessage("Peter");
        greetService2.sayMessage("John");
    }

}

Output

Hello Peter
Hello John

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/LambdaDemo_parenthesis_app.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/LambdaDemo_parenthesis_app

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/4c13bd19ff03c6acdc5e87d7803290d625ce640a/BasicJava/LambdaDemo_parenthesis_app/?at=master

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