Question

import java.util.ArrayList;

public class Card {

  int number;
  String suit;

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

      @Override
        public String toString() {

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

            String type;

            if (number < 10) {
              return String.valueOf(this.number) + " of " + this.suit;
            }
            else {
              return high[this.number-10] + " of " + this.suit;
            }

            //return suit + " of " + type;

          //return String.valueOf(number) + " of " + 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]));
            currentCard.toString();
      }
    }



    // @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;
    //   }

    // currentCard.toString();

  }
}

除了Card类中的toString方法之外，一切都有效。不是100％确定问题是什么，错误信息是

Card.java:13：错误：＆＃39;;＆＃39;预期 public String toString（）{

感谢任何帮助谢谢

Answer 1

您的toString()方法位于Card(int number, String suite)构造函数中。把它移出来。

Answer 2

String method位于类卡的构造函数内部，将其移到外面以便您可以使用它，因此您可以使用有效的卡constr。

Answer 3

将toString放在构造函数之外。

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

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

            String type;

            if (number < 10) {
              return String.valueOf(this.number) + " of " + this.suit;
            }
            else {
              return high[this.number-10] + " of " + this.suit;
            }
    }

Answer 4

你的toString（）方法在你的构造函数中;

这是更正后的代码

public class Card {

  int number;
  String suit;

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


      @Override
        public String toString() {

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

            String type;

            if (number < 10) {
              return String.valueOf(this.number) + " of " + this.suit;
            }
            else {
              return high[this.number-10] + " of " + this.suit;
            }

            //return suit + " of " + type;

          //return String.valueOf(number) + " of " + suit;
        }

// your main starts from here..

如果您在eclipse ctrl + shift + f

中，请不要忘记格式化

如何在对象中创建toString方法？

4 个答案: