public class Demo01 {
    public static void main(String[] args) {
        Function<String, Integer> function = s -> {
            return s.length();
        };


        System.out.println(function.apply("aa"));
    }


public class Demo02 {
    public static void main(String[] args) {
        Predicate<String> predicate = (str) -> {
            return str.isEmpty();
        };

        System.out.println(predicate.test("a"));
    }


public class Demo03 {
    public static void main(String[] args) {
        Supplier<String> supplier = () -> {
            return "a";
        };
        System.out.println(supplier.get());
        Consumer<String> consumer = (s) -> {
            System.out.println(s);
        };
        System.out.println(consumer);
    }