Proper Java reimplementation for http://blog.javaslang.io/idiomatic-javaslang-the-for-comprehension/

make-dinner-right.java

public Optional<Dinner> makeDinner(GrillService service) {
	Optional<Charcoal> charcoal = service.getCharcoal();
	Optional<Lighter> lighter = service.getLighter();
	Optional<CornCob> cornCob = service.getCornCob();

	return Stream.of(charcoal, lighter, cornCob).allMatch(Optional::isPresent)
			? service.lightFire(charcoal.get(), lighter.get()).flatMap(fire -> service.grill(fire, cornCob.get()))
			: Optional.empty();
}