Functional interface

import java.util.Scanner;
import java.util.function.*;

class Main{
    public static void main(String[] args) {
        /**
         * Predicate
         * @FunctionalInterface public interface Predicate<T>
         */
//        Predicate<Integer> isPositive = x -> x>0;
//        System.out.println(isPositive.test(5));
        UnaryOperator<Integer> square = x -> x*x;
        System.out.println(square.apply(5));
        BinaryOperator<Integer> multiply = (x,y) -> x*y;
        System.out.println(multiply.apply(52,61));
        Function<Integer,String> convert = x -> x +" $";
        System.out.println(convert.apply(300));
        Supplier<User> userFactory = () -> {
            Scanner in = new Scanner(System.in);
            System.out.println("Enter name: ");
            String name = in.nextLine();
            return new User(name);
        };
        User user1 = userFactory.get();
        User user2 = userFactory.get();
        System.out.println("user1 name: " + user1.getName());
        System.out.println("user2 name: " + user2.getName());
//        Tutor.StringFunction exclaim = s -> s + "!";
//        Tutor.StringFunction ask = (s) -> s + "?";
//        printFormatted("Hello", exclaim);
//        printFormatted("Hello", ask);
//
//        ArrayList<Integer> numbers = new ArrayList<>();
//        numbers.add(1);
//        numbers.add(2);
//        numbers.add(3);
//        numbers.add(4);
//        numbers.add(5);
//        for(Integer number : numbers){
//            System.out.print(number);
//        }
//        System.out.println("\n");
//        numbers.forEach((n) -> System.out.print(n));
//        System.out.println("\n");
//        numbers.forEach(System.out::print);

    }
    public static void printFormatted(String str, StringFunction format){
        String result = format.run(str);
        System.out.println(result);
    }
}
class User{
    private final String name;
    String getName(){
        return name;
    }
    User(String n){
        this.name = n;
    }
}
interface StringFunction{
    String run(String str);
}