java - 使用用户输入的数字重复 for 循环

Question

有一个程序，当按下回车按钮时，它能够从标准扑克牌中发牌。一切正常，但我需要添加功能来询问用户从一开始他们想要使用多少套牌。我有一个扫描仪，它接受该输入并将其设置为变量。

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

然后这就是我用每张卡填充 ArrayList 的方式

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

我实现此功能的想法是将 for 循环嵌套在另一个循环中，该循环将运行循环与 numberOfDecks 的值一样多的次数。

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
        }

我尝试这样做，但由于某种原因，无论 numberOfDecks 的值如何，count 永远不会解析为大于 0。然后，我得到一个大小正确的 ArrayList，但前 52 个条目之外的每个条目都是空白，因为循环不会超过一次。有人能看到我做错了什么吗？

编辑:为了澄清起见，这里是整个程序。

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

看看我对代码的评论(我已经删除了你的评论)。我认为这就是你的问题所在，

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!");
                    } 
                }
            }
        }
    }
}