Java 8 Lambda Expressions

I'll try to explain the topic according to my motto --"No bullshit , Just Code.."

1) SAM= Single Abstract Method = An Interface with Only One Method = Functional Interface

	@FunctionalInterface
	public interface StateChangeListener {
	public String onStateChange(State oldState, State newState);
	}

view raw sam hosted with ❤ by GitHub

2) A class with a method which will consume a lambda expression

	public class StateManager {
	public void addNewStateListener(StateChangeListener listener) { //blahh }
	}

view raw LamdbaConsumer hosted with ❤ by GitHub

3) Now.. Actionnn...Lambda expression as a parameter

	StateManager stateManager = new StateManager();
	stateManager.addNewStateListener(
	(oldState, newState) -> System.out.println("State changed")
	);

view raw Lamdba Expression Usage Example hosted with ❤ by GitHub

Okeyy... I know some of you need bullshit also :)

If you want to pass a behavior to a parameter (behavior= function=action) just create an interface and annotate it @FunctionalInterface and use Lambda Syntax like i did in above.

(param1,param2,,,,,paramN) -> {play with params}

Java 8 lots of built in @FunctionalInterface inside it. You can use them anywhere you need. Just  google for them .

Bye