Question

我试图制作一个甲板改组方法。我在Stack Overflow上搜索了答案，但一直无法弄明白。

我想创建一个shuffle方法。此方法将从0到甲板大小之间的数组中选取两个随机数。然后我希望将这两个数字作为参数传递给我的swap（）方法。我想创建一个循环，以便交换方法被调用TIMES_TO_SHUFFLE次。这样做的最佳方式是什么？

这是甲板课。

import java.util.ArrayList;

/**
 * Deck of cards.   
 * @author Stefan
 * @version 2014.11.19
 */
public class Deck {   
    private ArrayList<Card> deck;

    public static final int TIMES_TO_SHUFFLE = 10;

    /**
     * Constructor for objects of class Deck
     * Creates a new container for Card objects
     */
    public Deck() {
        deck = new ArrayList<Card>();    
    }

    /**
     * Swap two cards that the user chooses.
     */   
    public void swap(int indexA, int indexB) {
        Card temp = deck.get (indexA);
        deck.set(indexA, deck.get (indexB)); 
        deck.set(indexB, temp); 
    }

    /**
     * Shuffles two cards by passing parameters to the swapCards method
     */
    private void shuffle() {

    }

    /**
     * Add a card to the deck.
     * @param Card to be added
     */
    public void addCard(Card cardToAdd) {
        deck.add(cardToAdd);
    }

    /**
     * Take the first card from the deck.
     * @return Card or null
     */
    public Card takeCard()  {
        if(deck.isEmpty()) {
            return null; 
        } else {  
        // get the top card
            return deck.remove(0);
        }
    }

    /**
     * Show the contents of the deck.
     */
   public void showDeck()  {
        for(Card eachCard : deck) {
            System.out.println(eachCard.getDescription()+ 
            " of " + eachCard.getSuit());
        }
    }
}

这是卡类。

/**
 * Card class - a typical playing card.
 * 
 * @author Stefan
 * @version 2014.11.18
 */
public class Card {
    private String suit;
    private int value;
    private String description;

    /**
     * @default constructor
     */
    public Card(){
    }

    /**
     * Constructor for objects of class Card
     * @param suit e.g. "Hearts"
     * @param value e.g. 10
     * @param description e.g. "Ten"
     */
    public Card(String description, String suit, int value) {
        this.suit           = suit;
        this.value          = value;
        this.description    = description;
    }

    /**
     * @return the suit
     */
    public String getSuit() {
        return suit;
    }

    /**
     * @param suit the suit to set
     */
    public void setSuit(String suit) {
        this.suit = suit;
    }

    /**
     * @return the value
     */
    public int getValue() {
        return value;
    }

    /**
     * @param value the value to set
     */
    public void setValue(int value) {
        this.value = value;
    }

    /**
     * @return the description
     */
    public String getDescription() {
        return description;
    }

    /**
     * @param description the description to set
     */
    public void setDescription(String description) {
        this.description = description;
    }

}

Answer 1

shuffle方法如下所示：

 private void shuffle() {
      Deck ob = new Deck();
      int x = deck.size() - 1;
      for(int i = 0; i < TIMES_TO_SHUFFLE + 1; i ++){
      int r1 = (int) Math.floor(Math.random() * x);
      int r2 = (int) Math.floor(Math.random() * x);
      ob.swap(r1, r2);
}
    }

如何在数组中创建循环shuffle方法

1 个答案: