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java - 将 ArrayList 转换为字符串
转载 作者：行者123 更新时间：2023-12-02 09:16:12 25 4
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嗨，我正在尝试练习 java，而且才刚刚开始!为了练习，我尝试构建一个简单的扑克游戏，但陷入了卡牌数组列表的困境。我试图将其打印出来，但仅将地址输出到控制台，当然我尝试使用 .toString 方法并创建我自己的 toString 方法来尝试检查数组列表是否输入正确。波纹管是我的 Card 类，带有 Arraylist{Card} Deck。下面是我的代码

package poker;

import java.util.ArrayList;

public class Card {
    private String _suit;
    private int _cardNum;

    public Card(int cardNum, String suit) {
        _suit = suit;
        _cardNum = cardNum;
    }
    public String toString() {
        return _suit +_cardNum;
    }

    static ArrayList<`enter code here`Card> Deck = new ArrayList<Card>() {{
        add(new Card(0,"Hearts"));
        add(new Card(1,"Hearts"));
        add(new Card(1,"Hearts"));
        add(new Card(2,"Hearts"));
        add(new Card(3,"Hearts"));
        add(new Card(4,"Hearts"));
        add(new Card(5,"Hearts"));
        add(new Card(6,"Hearts"));
        add(new Card(7,"Hearts"));
        add(new Card(8,"Hearts"));
        add(new Card(9,"Hearts"));
        add(new Card(10,"Hearts"));
        add(new Card(11,"Hearts"));
        add(new Card(12,"Hearts"));
        add(new Card(13,"Hearts"));
        add(new Card(0,"Spades"));
        add(new Card(1,"Spades"));
        add(new Card(2,"Spades"));
        add(new Card(3,"Spades"));
        add(new Card(4,"Spades"));
        add(new Card(5,"Spades"));
        add(new Card(6,"Spades"));
        add(new Card(7,"Spades"));
        add(new Card(8,"Spades"));
        add(new Card(9,"Spades"));
        add(new Card(10,"Spades"));
        add(new Card(11,"Spades"));
        add(new Card(12,"Spades"));
        add(new Card(13,"Spades"));
        add(new Card(0,"Clubs"));
        add(new Card(1,"Clubs"));
        add(new Card(2,"Clubs"));
        add(new Card(3,"Clubs"));
        add(new Card(4,"Clubs"));
        add(new Card(5,"Clubs"));
        add(new Card(6,"Clubs"));
        add(new Card(7,"Clubs"));
        add(new Card(8,"Clubs"));
        add(new Card(9,"Clubs"));
        add(new Card(10,"Clubs"));
        add(new Card(11,"Clubs"));
        add(new Card(12,"Clubs"));
        add(new Card(13,"Clubs"));
        add(new Card(0,"Diamonds"));
        add(new Card(1,"Diamonds"));
        add(new Card(2,"Diamonds"));
        add(new Card(3,"Diamonds"));
        add(new Card(4,"Diamonds"));
        add(new Card(5,"Diamonds"));
        add(new Card(6,"Diamonds"));
        add(new Card(7,"Diamonds"));
        add(new Card(8,"Diamonds"));
        add(new Card(9,"Diamonds"));
        add(new Card(10,"Diamonds"));
        add(new Card(11,"Diamonds"));
        add(new Card(12,"Diamonds"));
        add(new Card(13,"Diamonds"));
    }};
}

和我的主应用程序

package poker;

import java.util.Random;
import static java.lang.System.out;

public class MainApp {

    public static void main(String[] args) {
        for(int i = 0;i <Card.Deck.size();i++) {
            out.println(Card.toString());

        }
    }
}

在打印行中是我的问题发生的地方。如何将数组列表从类类型转换为字符串以进行输出？提前致谢!

最佳答案

由于toString()不是静态方法，因此您需要在类的实例上调用它。因此，将 out.println(Card.toString()); 行更改为 out.println(Card.Deck.get(i).toString());您的主应用程序。

顺便说一句，我注意到你每套有 14 张牌，我认为这是无意的。

关于java - 将 ArrayList<Object> 转换为字符串，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/58966430/

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