java - ArrayList get 方法的问题

Question

在 ArrayList 类中使用“get”方法时遇到问题。

Main 方法应该在 ArrayList 中创建一副纸牌，然后显示所有纸牌。我只是在寻找关于为什么在我的主要方法(游戏类)中出现“d.get(i)”错误的解释。如果我在甲板类中使用它，它工作正常。

游戏类:

package game;
import java.util.*;

public class Game {

public static void main(String[] args) {

    /*Card f = new Card(2,7);
    System.out.println(f.toString());*/

    Deck d = new Deck();
    int i = 0;

    while(i < 52)
    {
        //where error occurs:
        Card k = d.get(i);//get is underlined red
        System.out.println(d.toString());
        i++;
    }

}

}

卡片类:

package game;

public class Card {

private int suit, value;
private String[] cardSuit = {"Spades", "Diamonds", "Hearts", "Clubs"};
private String[] cardValue = {"Ace", "King", "Queen", "Jack", "10",
                               "9", "8", "7", "6", "5", "4", "3", "2"};

public Card(int cSuit, int cValue)
{
    suit = cSuit; 
    value = cValue;
}

public String toString()
{
    String cardInfo = cardValue[value] + " of " + cardSuit[suit];

    return cardInfo;
}

public int getValue()
{
    return value;

}

public int getSuit()
{
    return suit;
}


}

甲板类:

package game;
import java.util.*;

public class Deck {

private ArrayList<Card> deck;

public Deck(){

    deck = new ArrayList<>();

    for(int i = 0;i<4;i++){
        for(int j = 0;j<13;j++){

        deck.add(new Card(i,j));

        }       
    }

}
}

Answer 1

您可以在 Deck 类中为 ArrayList 实现一个 getter，或者向 Deck 类添加一个 get 方法并委托(delegate)给数组列表:

public Card get(int index) {
    return this.deck.get(index);
}