明天JAVA考试了 完全没基础 请帮我详细注释一下，才能背出来 想过考试。。。。。

package ClassWork.exam.Card;
import java.io.Flushable;
public class Card {
public static enum Flush {
HEART(0),
SPADE(1),
DIAMOND(2),
CLUB(3),
JOKER(4);

    private int value;

    Flush(int value) {
        this.value = value;
    }

    public int getValue() {
        return this.value;
    }

    public static Flush fromValue(int value) {
        for (Flush f : Flush.values())
            if (f.getValue() == value)
                return f;
        throw new RuntimeException("Unknown flush");
    }
}

private Flush flush;
private int number;

public Card(Flush flush, int number) {
    this.flush = flush;
    this.number = number;
}

public Flush getFlush() {
    return this.flush;
}

public int getNumber() {
    return this.number;
}

@Override
public String toString() {
    return this.flush + " : " + this.number;
}

}
package ClassWork.exam.Card;

import java.util.ArrayList;
import java.util.List;

public class Deck {
private static final int MAX_NUM = 18;

private List<Card> cards;

public Deck() {
    cards = new ArrayList<>();
}

public void add(Card.Flush flush, int number) {
    add(new Card(flush, number));
}

public void add(Card card) {
    cards.add(card);
}

public boolean contain(Card.Flush flush, int number) {
    for (Card c : cards) {
        if (c.getFlush() == flush && c.getNumber() == number)
            return true;
    }

    return false;
}

public boolean isFull() {
    return cards.size() == Deck.MAX_NUM;
}

public void reset() {
    cards.clear();
}

@Override
public String toString() {
    StringBuilder sb = new StringBuilder();

    for (Card c : cards) {
        if (sb.length() > 0)
            sb.append(", ");
        sb.append(c);
    }

    return sb.toString();
}

}
package ClassWork.exam.Card;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Poker {
private static final int TOTAL_CARDS = 54;

private Deck deckA;

private Deck deckB;

private Deck deckC;

private Random rand;

public Poker() {
    this.deckA = new Deck();
    this.deckB = new Deck();
    this.deckC = new Deck();

    this.rand = new Random();
}

public Deck getDeckA() {
    return this.deckA;
}

public Deck getDeckB() {
    return this.deckB;
}

public Deck getDeckC() {
    return this.deckC;
}

public void deal() {
    this.rand.setSeed(System.currentTimeMillis());

    deckA.reset();
    deckB.reset();
    deckC.reset();

    List<Integer> cache = new ArrayList<>();
    for (; cache.size() < Poker.TOTAL_CARDS; ) {
        int num = rand.nextInt(TOTAL_CARDS);
        if (Poker.contains(cache, num))
            continue;
        cache.add(num);
    }

    for (int i = 0; i < Poker.TOTAL_CARDS / 3; i++) {
        int num = cache.get(i);
        Poker.deal(deckA, num);
    }

    for (int i = 18; i < 2 * Poker.TOTAL_CARDS / 3; i++) {
        int num = cache.get(i);
        Poker.deal(deckB, num);
    }

    for (int i = 36; i < Poker.TOTAL_CARDS; i++) {
        int num = cache.get(i);
        Poker.deal(deckC, num);
    }
}

private static boolean contains(List<Integer> cache, int num) {
    return cache.contains(num);
}

public static void deal(Deck deck, int num) {
    if (num < TOTAL_CARDS - 2)
        deck.add(Card.Flush.fromValue(num % 4), num / 4 + 1);
    else {
        if (num == TOTAL_CARDS - 2)
            deck.add(Card.Flush.JOKER, 0);
        else
            deck.add(Card.Flush.JOKER, 1);
    }
}

}

加油，少年