Demo of cartesian product

Card.java

package com.bazlur;

import java.util.EnumSet;
import java.util.Set;
import java.util.List;
import java.util.function.BiFunction;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Card {
    enum Suit {
        CLUBS,
        SPADES,
        HEARTS,
        DIAMONDS
    }

    enum RANK {
        ACE,
        TWO,
        THREE,
        FOUR,
        FIVE,
        SIX,
        SEVEN,
        EIGHT,
        NIGHT,
        TEN,
        JACK,
        QUEEN,
        KING
    }

    private Suit suit;
    private RANK rank;

    public Card(Suit suit, RANK rank) {
        this.suit = suit;
        this.rank = rank;
    }

    @Override
    public String toString() {
        return suit + " - " + rank;
    }


    private static <A, B, C> Stream<C> cartesianProduct(Set<A> setA, Set<B> setB,
                                                        BiFunction<A, B, C> function) {

        return setA.stream()
                .flatMap(first ->
                        setB.stream()
                                .map(second -> function.apply(first, second)));
    }

    public static List<Card> allCards() {

        return cartesianProduct(
                EnumSet.allOf(Suit.class),
                EnumSet.allOf(RANK.class),
                Card::new)
                .collect(Collectors.toList());
    }


    public static void main(String[] args) {
        Card.allCards()
                .forEach(System.out::println);
    }
}