Java 8 Lambda Building Blocks: Predicate, Function, Consumer, Supplier, BinaryOperator

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	Predicate<T>-- T in ,boolean out
	Predicate<Man> richManMatcher = m->m.getCashAmount () > 1000000;
	if (richManMatcher.test (someMan)) {
	marryWithRichMan (someMan);
	}
	Function<T,R> -- Tin, R out
	Function<Worker,Integer> salaryIncreaser = w->w.getSalary () + 500;
	for (Worker worker: workers){
	worker.setSalary (salaryIncreaser.apply(worker));
	}
	// OR with Method References
	workers.stream ().map (salaryIncreaser::apply);
	BiFunction<T,U,R> -- Tin, R out
	Worker worker = new Worker ("worker",120,80);
	List<Worker> workers = new ArrayList<> ();
	BiFunction<Integer, Integer, Integer> bodyIndexCalculator = (h,w) -> h/w;
	Integer workerBodyIndex = bodyIndexCalculator.apply (worker.getHeight (), worker.getWeight ());
	workers.stream ().mapToInt (w->bodyIndexCalculator.apply (w.getHeight (),w.getWeight ())).average ();
	Consumer<T> --T in, void
	Consumer<Worker> salaryIncreaser = w->w.setSalary (w.getSalary () * 1.2);
	for (Worker worker: workers){
	salaryIncreaser.accept(worker));
	}
	Supplier<T> -- Nothing In -- T out
	Supplier<Worker> hardWorkingWorkerSupplier = ()->randomWorkerFromSomeWhere();
	Worker w = hardWorkingWorkerSupplier.get();
	BinaryOperator<T> -- TwoT's in, T out
	BinaryOperator<Integer> multiplier = (n1,n2) ->n1 * n2;
	int multipliedvalue = multiplier.apply (n1,n2);

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