C#入门精典中的一个例子看不懂请帮助小弟!!
Card类: 
程序代码：
public class Card
{
public readonly Suit suit;
public readonly Rank rank;
public override string ToString()
{
return "The " + rank + " of " + suit + "s";
}
private Card()
{
}
public Card(Suit newSuit, Rank newRank)
{
suit = newSuit;
rank = newRank;
}
}
Deck类:
程序代码：
public class Deck
{
public Deck()
{
cards = new Card[52];
for (int suitVal = 0; suitVal < 4; suitVal++)
{
for (int rankVal = 1; rankVal < 14; rankVal++)
{
cards[suitVal * 13 + rankVal -1] = new Card((Suit)suitVal,(Rank)rankVal);
}
}
}
private Card[] cards;
public Card GetCard(int cardNum)
{
if (cardNum >= 0 && cardNum <= 51)
return cards[cardNum];
}
}
控制台程序入口:
程序代码：
static void Main(string[] args)
{
Deck myDeck = new Deck();
myDeck.Shuffle();
for (int i = 0; i < 52; i++)
{
Card tempCard = myDeck.GetCard(i);
Console.Write(tempCard.ToString());
if (i != 51)
Console.Write(", ");
else
Console.WriteLine();
}
}
我有两个问题：
一，我不明白其中Deck类的字段为什么可以这样定义private card[] cards？
二，为什么可以直接调用Card类中的重写的ToString方法？
