java - 如何从对象打印不同的原始值

Question

这个问题已经有答案了:

How to make toString method within object? (4 个回答)

已关闭 7 年前。

import java.util.ArrayList;

public class Card {

  int number;
  String suit;

  public Card(int number, String suit) {
    this.number = number;
    this.suit = suit;
  }

  public static void main(String[] args) {

    String[] suit = {
      "Clubs",
      "Diamonds",
      "Spades",
      "Hearts"
    };

    String[] high = {
      "Jack",
      "Queen",
      "King"
    };

    ArrayList<Card> deckOfCards = new ArrayList<Card>(52);

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

        deckOfCards.add(new Card (i+1, suit[j]));
      }
    }



    @Override
    public String toString(Card card) {

      this.suit = suit;
      this.number = number;

      String type;

      if (number < 10) {
        type = Integer.toString(number);
      }
      else {
        type = high[i-number];
      }

      return suit + " of " + type;
      }

  }
}

所以我有一个名为card的对象，我想用底部的方法打印花色(字符串)和上面的数字(整数)，但我不是100%确定如何做到这一点。不用说，底部的部分无法编译或工作

谢谢

Answer 1

这应该放在你的 Card 类中:

@Override
public String toString() {
    return String.valueOf(this.number) + " of " + this.suit;
}

像这样调用函数:

currentCard.toString();

或者将其打印到控制台，如下所示:

System.out.println(currentCard.toString());