Рекурсия: почему у меня есть ошибка?

Question

public class RandomCard { 
    int num; 
    int suitNum; 
    String cardSuit = new String(""); 
    String cardNum = new String(""); 
    String fullCard = new String(""); 
    public RandomCard(){ 
     num= (int)(Math.random()*13)+2; 
     suitNum =(int)(Math.random()*4)+1; 

     if(num == 11) 
      cardNum="Jack"; 
     else if(num== 12) 
      cardNum="Queen"; 
     else if(num== 13) 
      cardNum= "King"; 
     else if(num== 14) 
      cardNum= "Ace"; 
     else 
      cardNum= ""+num; 

     if(suitNum==1) 
      cardSuit= "Hearts"; 
     else if(suitNum==2) 
      cardSuit= "Spades"; 
     else if(suitNum==3) 
      cardSuit= "Clubs"; 
     else 
      cardSuit= "Diamonds"; 
    } 
    public String getNum(){ 
     return cardNum; 
    } 
    public String getSuit(){ 
     return cardSuit; 
    } 
    public String toString(){ 
     return fullCard= cardNum+" of "+cardSuit; 
    } 
} 
public class RandomCardDecK { 
     ArrayList<RandomCard> deck = new ArrayList<RandomCard>(); 
     String order = new String(""); 
     public RandomCardDeck(){ 
      while (deck.size()<52){ 
       checkDeck(deck); 
      } 
     } 
     public ArrayList<RandomCard> checkDeck(ArrayList<RandomCard>Deck){ 
      RandomCard card = new RandomCard(); 
      for (int i=0; i<=Deck.size();i++){ 
       if (card.equals(Deck.get(i))){ 
        checkDeck(Deck); 
       } 
       else 
        Deck.add(card); 

      } 

    return Deck; 
    } 
    public String toString(){ 
     for (int i=0; i<=deck.size();i++){ 
      order += deck.get(i); 
     } 
    return order; 

    } 
} 

Я пытаюсь создать потертую колоду карт, а затем отобразить колоду. Я новичок в программировании, и я не понимаю, что не так с рекурсией в моей программе, но бросает мне ошибку времени выполнения.

Answer 1

Edit 2: Я обновил ответ теперь вы можете проверить результат он прекрасно работает

Редактировать 3: Добавлен компаратор, так что результат может быть более ясным

import java.util.ArrayList; 
import java.util.Collections; 
import java.util.Comparator; 

public class RandomCard implements Comparator<RandomCard> { 

    int num; 
    int suitNum; 
    String cardSuit = ""; 
    String cardNum = ""; 

    public RandomCard() { 
     num = (int) (Math.random() * 13) + 2; 
     suitNum = (int) (Math.random() * 4) + 1; 

     if (num == 11) { 
      cardNum = "Jack"; 
     } else if (num == 12) { 
      cardNum = "Queen"; 
     } else if (num == 13) { 
      cardNum = "King"; 
     } else if (num == 14) { 
      cardNum = "Ace"; 
     } else { 
      cardNum = "" + num; 
     } 

     if (suitNum == 1) { 
      cardSuit = "Hearts"; 
     } else if (suitNum == 2) { 
      cardSuit = "Spades"; 
     } else if (suitNum == 3) { 
      cardSuit = "Clubs"; 
     } else { 
      cardSuit = "Diamonds"; 
     } 
    } 

    public int getNum() { 
     return num; 
    } 

    public int getSuitNum() { 
     return suitNum; 
    } 

    public String getCardSuit() { 
     return cardSuit; 
    } 

    public String getCardNum() { 
     return cardNum; 
    } 

    @Override 
    public boolean equals(Object obj) { 
     if (obj == null) { 
      return false; 
     } 
     RandomCard randomCard = (RandomCard) obj; 
     return this.getNum() == randomCard.getNum() && this.getSuitNum() == randomCard.getSuitNum(); 
    } 

    @Override 
    public String toString() { 
     return cardNum + " of " + cardSuit; 
    } 

    @Override 
    public int compare(RandomCard o1, RandomCard o2) { 
     int c = new Integer(o1.getNum()).compareTo(o2.getNum()); 
     if (c == 0) { 
      c = new Integer(o1.getSuitNum()).compareTo(o2.getSuitNum()); 
     } 
     return c; 
    } 

    public static class RandomCardDeck { 

     ArrayList<RandomCard> deck; 
     String order = ""; 

     public RandomCardDeck() { 
      deck = new ArrayList<>(); 
      checkDeck(new RandomCard(), 0); 
      //your deck is now full with 52 cards 
     } 

     public ArrayList<RandomCard> getDeck() { 
      return deck; 
     } 

     private void checkDeck(RandomCard card, int i) { 
      if (deck.size() == 52) { 
       return; 
      } 
      if (i >= deck.size()) { 
       deck.add(card); 
       checkDeck(new RandomCard(), 0); 
      } else if (card.equals(deck.get(i))) { 
       checkDeck(new RandomCard(), 0); 
      } else { 
       checkDeck(card, ++i); 
      } 
     } 

     @Override 
     public String toString() { 
      for (int i = 0; i <= deck.size(); i++) { 
       order += deck.get(i); 
      } 
      return order; 

     } 
    } 

    public static void main(String[] args) { 
     RandomCardDeck cardDeck = new RandomCardDeck(); 
     Collections.sort(cardDeck.getDeck(), new RandomCard()); 
     for (RandomCard randomCard : cardDeck.getDeck()) { 
      System.out.println(randomCard); 
     } 
    } 
} 

результат:

run: 
2 of Hearts 
2 of Spades 
2 of Clubs 
2 of Diamonds 
3 of Hearts 
3 of Spades 
3 of Clubs 
3 of Diamonds 
4 of Hearts 
4 of Spades 
4 of Clubs 
4 of Diamonds 
5 of Hearts 
5 of Spades 
5 of Clubs 
5 of Diamonds 
6 of Hearts 
6 of Spades 
6 of Clubs 
6 of Diamonds 
7 of Hearts 
7 of Spades 
7 of Clubs 
7 of Diamonds 
8 of Hearts 
8 of Spades 
8 of Clubs 
8 of Diamonds 
9 of Hearts 
9 of Spades 
9 of Clubs 
9 of Diamonds 
10 of Hearts 
10 of Spades 
10 of Clubs 
10 of Diamonds 
Jack of Hearts 
Jack of Spades 
Jack of Clubs 
Jack of Diamonds 
Queen of Hearts 
Queen of Spades 
Queen of Clubs 
Queen of Diamonds 
King of Hearts 
King of Spades 
King of Clubs 
King of Diamonds 
Ace of Hearts 
Ace of Spades 
Ace of Clubs 
Ace of Diamonds 
BUILD SUCCESSFUL (total time: 0 seconds)