Demo.java

import java.util.Arrays;
import java.util.List;
import java.util.function.Function;

public class Demo {

	public static void main(String[] args) {

		Grill grill = new Grill();
		Cooker broilReference = () -> grill.broil("Steak");
		List<Cooker> cookers = Arrays.asList(broilReference, new Microwave()::nuke);

		for (Cooker c : cookers) {
			c.cook();
		}
		
		Function<String, String> cookAThing = (foo) -> grill.broil(foo);
		
		cookAThing.apply("Shrimp");
		cookAThing.apply("Zucchini");
	}

	// @FunctionalInterface
	interface Cooker {
		void cook();
	}

	static class Grill {
		String broil(String food) {
			System.out.println("broiled " + food + "!");
			return food;
		}
	}

	static class Microwave {
		void nuke() {
			System.out.println("nuked it!");
		}
	}
}