如何“洗牌"数组? [英] How to "shuffle" an array?

问题描述

我在尝试创建shuffleDeck()"方法时遇到了困难.

I am having a tough time trying to create a "shuffleDeck()" method.

我想做的是创建一个方法，该方法将采用数组参数(将是一副纸牌)洗牌，并返回洗牌后的数组列表.

What I am trying to do is create a method that will take an array parameter (which will be the deck of cards) shuffle the cards, and return the shuffled array list.

这是代码:

class Card
{
    int value;
    String suit;
    String name;

    public String toString()
    {
        return (name + " of " + suit);
    }
}

public class PickACard
{
    public static void main( String[] args)
    {   
        Card[] deck = buildDeck();
        // display Deck(deck); 

        int chosen = (int)(Math.random()* deck.length);
        Card picked = deck[chosen];

        System.out.println("You picked a " + picked + " out of the deck.");
        System.out.println("In Blackjack your card is worth " + picked.value + " points.");

    }

    public static Card[] buildDeck()
    {
        String[] suits = {"clubs", "diamonds", "hearts", "spades" };
        String[] names = {"ZERO", "ONE", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "Jack", "Queen", "King", "Ace" };

        int i = 0;
        Card[] deck = new Card[52];

        for ( String s: suits )
        {   
            for ( int v = 2; v<=14; v++)
            {
                Card c = new Card();
                c.suit = s;
                c.name = names[v];
                if ( v == 14)
                    c.value = 11;
                else if ( v>10)
                    c.value = 10;
                else
                    c.value = v; 

                deck[i] = c;
                i++;
            }
        }
        return deck; 
    }

    public static String[] shuffleDeck( Card[] deck) 
    {
        /** I have attempted to get two index numbers, and swap them. 
        I tried to figure out how to loop this so it kind of simulates "shuffling". 
        */
    }

    public static void displayDeck( Card[] deck)
    {
        for ( Card c: deck) 
        {   
            System.out.println(c.value + "\t" + c);
        }
    }
}

推荐答案

怎么样:

List<Card> list =  Arrays.asList(deck);
Collections.shuffle(list);

或单线:

Collections.shuffle(Arrays.asList(deck));

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