@Test

public void testFunctionalInterface() {

Predicate<Integer> greater10 = x -> x > 10;

Consumer<Integer> print = x -> System.out.println(x);

Function<Integer, String> intToString = x -> Integer.valueOf(x).toString();

Supplier<Integer> randInt = () -> ThreadLocalRandom.current().nextInt();

Comparator<Integer> less = (x, y) -> y - x;

UnaryOperator<Integer> power = x -> x * x;

BinaryOperator<Integer> add = (x, y) -> x + y;

BiConsumer<Integer, String> printis = (i, s) -> System.out.println(i + s);

Runnable run = () -> System.out.println("hello world");

}

@Test

public void testMethodReference() {

Consumer<Integer> print = System.out::println;

Predicate<String> empty = String::isEmpty;

Supplier<Date> date = Date::new;

}