java - 类中的 "store"对象是什么意思？

Question

我正在做一个 Java 家庭作业，上面写着:

The programming projects of Chapter 4 discussed a Card class that represents a standard playing card. Create a class called DeckofCards that stores 52 objects of the Card class. Include methods to shuffle the deck, deal a card, and report the number of cards left in the deck. The shuffle method should assume you have a full deck. Create a driver class with a main method that deals each card from a shuffled deck, printing each card as it is dealt.

它说的地方

Create a class called DeckofCards that stores 52 objects of the Card class.

我不确定存储某些东西意味着什么。这是否意味着将 52 个对象创建到一个类中？或者，假设 Card 类中已经创建了 52 个对象，将所有这些对象放在另一个对象或构造函数中？我确实做了一个卡片类，但是，我没有制作 52 个对象，卡片组中也有 52 张卡片，所以我假设 52 个对象与 52 张卡片相同。无论如何，如果需要，这里是我的卡片类的代码:

import java.util.Random;

public class CardClass {

    private static Random generator = new Random();
    private int suit, num;
    private String cardSuit, cardNum;

    public CardClass() {
        shuffle();
    }

    public void shuffle() {
        num = generator.nextInt(13) + 1; 
        suit = generator.nextInt(4) + 1; 
    }

    public String toString() {
        if (num >=2 && num <= 10)
            cardNum = Integer.toString(num);
        else if (num == 1)
            cardNum = "Ace";
        else if (num == 11)
            cardNum = "Jack";
        else if (num == 12)
            cardNum = "Queen";
        else 
            cardNum = "King";

        if (suit == 1)
            cardSuit = "Spades";
        else if (suit == 2)
            cardSuit = "Hearts";
        else if (suit == 3)
            cardSuit = "Clubs";
        else 
            cardSuit = "Diamonds";

        return cardNum + " of " + cardSuit;     
    }
}

这也是我第一次来到这个社区，所以对于我犯的任何错误，我深表歉意，并在此先感谢您的所有帮助。

Answer 1

这意味着您的 DeckOfCards 类应该包含一个大小为 52 的数组，用于存储 Card 实例。你总是可以使用另一种数据结构，比如链表。该数组可能应该是 DeckOfCards 中的私有(private)属性，例如

private Card cards[]=new Card[52];

然后用 Card 对象填充数组:

for(int i=0;i<52;i++){
    int cardType=i/13;
    String type="Heart";
    if(cardType==0)type="Spades";
    else if(cardType==1)type="Clubs";
    else if(cardType==2)type="Diamond";
    cards[i]=new Card(i, cardType);
}

此外，您最好在 Stack Overflow 中提问编程问题。