使用用戶輸入的編號重複循環

Question

有一個程序能夠在按下輸入按鈕時從標準播放卡片上發牌。一切正常，但我需要添加功能，從一開始就詢問用戶他們想要使用多少套牌。我有一臺掃描儀，它接受輸入並將其設置爲一個變量。

Scanner scanner = new Scanner(System.in); 
int numberOfDecks = scanner.nextInt(); 

那麼這就是我如何填充ArrayList中，每個卡

  for (int i = 0; i < deck.length; i++) { 
        deck[i] = faces[i % 13] + suit[i/13]; 
      } 

我的想法來實現此功能將巢，對中的另一個循環，這將運行循環多次的值爲numberOfDecks。

for (int count = 0; count <= numberOfDecks; count++){ 
      for (int i = 0; i < deck.length; i++) { 
        deck[i] = faces[i % 13] + suit[i/13]; 
      } //Creates array with all possible cards in standard deck of cards 
     } 

我想這樣做，但出於某種原因count從未解析爲大於0不管的numberOfDecks值。然後，我剩下一個ArrayList，其大小正確，但是第52個以外的每個條目都是空白的，因爲循環永遠不會超過一次。有人可以看到我做錯了什麼嗎？

編輯：澄清，這裏是整個程序。

public class Card { 

    public static void main(String[] args) { 
     System.out.println("How many decks would you like to use?"); 
      Scanner scanner = new Scanner(System.in); 
      int numberOfDecks = scanner.nextInt(); 
      String[] suit = {" of Diamonds", " of Spades", " of Hearts", " of Clubs"}; //Array of suits 
      String[] faces = {"Ace", "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King"};//Array of face values 
      String[] deck = new String[52 * numberOfDecks];//Array of actual deck 
      boolean deckComplete = false;//Boolean for finished deck 
      int[] random = new int[52]; //Array with all possible numbers between 1-52 

      for (int x = 0; x<random.length; x++) { 
        random[x] = x; 
      } //Fills array with all possible numbers between 1-52 

      Random rndNum = new Random(); 

     for (int count = 0; count <= numberOfDecks; count++){ 
      for (int i = 0; i < deck.length; i++) { 
        deck[i] = faces[i % 13] + suit[i/13]; 
      } //Creates array with all poassible cards in standard deck of cards 
     } 
      ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(deck)); //Converts above array into ArrayList 

      while (deckComplete == false) { 
        for (int i = 52; i >= 1; i--) { 
         String readString = scanner.nextLine(); 
          int randomNumber = rndNum.nextInt(i); 
          if (readString.equals("")) { 
            System.out.println(arrayList.get(random[randomNumber])); 
            arrayList.remove(random[randomNumber]); 
            if (i == 1) { 
              deckComplete = true; 
              System.out.println("You are out of cards!"); 
            } //Deals out random card from deck and removes each one used 
          } 
        } 

      } 
    } 
} 

Answer 1

看看我對代碼的評論（我刪除了你的評論）。我想，這是你的問題是，

import java.util.Random; 
import java.util.Scanner; 
import java.util.Arrays; 
import java.util.ArrayList; 
public class Card { 

    public static void main(String[] args) { 

     System.out.println("How many decks would you like to use?"); 
     Scanner scanner = new Scanner(System.in); 
     int numberOfDecks = scanner.nextInt(); 
     String[] suit = {" of Diamonds", " of Spades", " of Hearts", " of Clubs"}; 
     String[] faces = {"Ace", "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King"}; 
     String[] deck = new String[52 * numberOfDecks]; 
     boolean deckComplete = false; 
     //random must have the correct number of elements 
     int[] random = new int[52 * numberOfDecks]; 

     for (int x = 0; x<random.length; x++) { 
      random[x] = x; 
     } 

     Random rndNum = new Random(); 

     int i = 0; 

     for (int count = 0; count <= numberOfDecks; count++){ 

      for (i = i; i < deck.length; i++) { 

       System.out.println("i is " + i); 
       //you were doing the same for suit (i/13), but it should be as below 
       deck[i] = faces[i % 13] + suit[i % 4]; 
      } 

      //otherwise you are overiding the same values over and over again for each loop 
      i = i+52; 
     } 

     ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(deck)); 

     while (deckComplete == false) { 

      //depending of number of decks user selects it has more than 52 cards 
      for (int j = deck.length; j >= 1; j--) { 

       //so the user know what to do 
       System.out.println("Just hit enter to contine");  
       String readString = scanner.nextLine(); 
       int randomNumber = rndNum.nextInt(j); 

       if (readString.equals("")) { 

        System.out.println(arrayList.get(random[randomNumber])); 
        arrayList.remove(random[randomNumber]); 

        if (j == 1) { 

         deckComplete = true; 
         System.out.println("You are out of cards!"); 
        } 
       } 
      } 
     } 
    } 
} 

Answer 2

就像我在評論中說，對於每一個count，要覆蓋甲板的所有元素。

for (int i = 0; i < deck.length; i++) { 
    deck[i] = faces[i % 13] + suit[i/13]; 
} //Creates array with all poassible cards in standard deck of cards 

您只需要一個for循環，因爲您的卡組大小已經是52 * numberOfDecks。

另外，請點擊此處：suit[i/13]。這將導致IndexOutOfBoundException我去時，我/ 13會比西裝的尺寸爲4

變化，爲suit[i%4]

Answer 3

for (int i = 0; i < deck.length; i++) {

應該更大

for (int i = 52 * count; i < deck.length; i++) {

我需要計數從0到52 * numberOfDecks