lambda expression in java

StateOwner stateOwner = new StateOwner();

stateOwner.addStateListener(
    (oldState, newState) -> System.out.println("State changed")
);

Comparator<Developer> byName =
	(Developer o1, Developer o2)->o1.getName().compareTo(o2.getName());

(p1, p2) -> System.out.println("Multiple parameters: " + p1 + ", " + p2);