我在学习Java的过程中创建了这个程序，但每次运行它都会一遍又一遍地获得相同的卡片。我真的找不到问题，为什么我的卡片不随机？我真的不知道我错过了什么，我的洗牌方法不正确吗？
package blackjack;
import java.util.Scanner;
public class BlackJack {
public static void main(String[] args) {
System.out.println("Are you ready to play BlackJack?");
System.out.println();
playBlackjack();
System.out.println("Thanks for playing!");
}
static boolean playBlackjack() {
Deck deck;
Hand dealerHand;
Hand playerHand;
deck = new Deck();
dealerHand = new Hand();
playerHand = new Hand();
dealerHand.addCard( deck.dealCard() );
playerHand.addCard( deck.dealCard() );
dealerHand.addCard( deck.dealCard() );
playerHand.addCard( deck.dealCard() );
System.out.println();
if (dealerHand.getBlackjackValue() == 21) {
System.out.println("The dealer have the " + dealerHand.getCard(0)
+ " and the " + dealerHand.getCard(1) + ".");
System.out.println("You have the " + playerHand.getCard(0)
+ " and the " + playerHand.getCard(1) + ".");
System.out.println();
System.out.println("The dealer has Blackjack! The dealer wins!");
return false;
}
if (playerHand.getBlackjackValue() == 21) {
System.out.println("Dealer has the " + dealerHand.getCard(0)
+ " and the " + dealerHand.getCard(1) + ".");
System.out.println("User has the " + playerHand.getCard(0)
+ " and the " + playerHand.getCard(1) + ".");
System.out.println();
System.out.println("You have Blackjack. You win.");
return true;
}
while (true) {
// User decides whether to hit or stand
System.out.println();
System.out.println();
System.out.println("Your cards are:");
for ( int i = 0; i < playerHand.getCardCount(); i++ )
System.out.println(" " + playerHand.getCard(i));
System.out.println("The total of your hand is " + playerHand.getBlackjackValue());
System.out.println();
System.out.println("The dealer is showing the " + dealerHand.getCard(0));
System.out.println();
System.out.println("Do you hit(type 0) or stand(type 1)? ");
Scanner input = new Scanner(System.in);
int choice = input.nextInt();
if (choice != 0 && choice != 1){
System.out.println("0 or 1 must be inputted to continue ");}
while (choice != 0 && choice != 1);
if ( choice == 1 ) {
break;
}
else {
Card newCard = deck.dealCard();
playerHand.addCard(newCard);
System.out.println();
System.out.println("You hits and your card is the " + newCard);
System.out.println("The total of the hand is now " + playerHand.getBlackjackValue());
if (playerHand.getBlackjackValue() > 21) {
System.out.println();
System.out.println("Fool of a Took! You went over 21 and busted!");
return false;
}
}
}
//User has stood at this point. Poor fool
System.out.println();
System.out.println("You stand. Wouldn't it be nice to sit sometime?");
System.out.println("The dealer's cards are "+ dealerHand.getCard(0) + " and the " + dealerHand.getCard(1));
while (dealerHand.getBlackjackValue() <= 16) {
Card newCard = deck.dealCard();
System.out.println("The dealer hits and gets the " + newCard);
dealerHand.addCard(newCard);
if (dealerHand.getBlackjackValue() > 21) {
System.out.println();
System.out.println("The dealer busted! You win!");
return true;
}
}
System.out.println("The dealer's total is " + dealerHand.getBlackjackValue());
System.out.println();
if (playerHand.getBlackjackValue() == dealerHand.getBlackjackValue()) {
System.out.println("The house always wins on a tie. You lose :(");
return false;
}
else if (dealerHand.getBlackjackValue() >= playerHand.getBlackjackValue()) {
System.out.println("The dealer wins as he has " + dealerHand.getBlackjackValue()
+ " points to your " + playerHand.getBlackjackValue() + "!");
return false;
}
else {
System.out.println("You win because you had " + playerHand.getBlackjackValue()
+ " points while the dealer only had " + dealerHand.getBlackjackValue() + "!");
return true;
}
}
}
package blackjack;
public class Card {
private int suit;
private int rank;
public final static int SPADES = 0, // Codes for the 4 suits.
HEARTS = 1,
DIAMONDS = 2,
CLUBS = 3;
public final static int ACE = 1,
JACK = 11,
QUEEN = 12,
KING = 13;
public Card(int cRank, int cSuit) {
rank = cRank;
suit = cSuit;
}
public int getSuit() {
return suit;
}
public int getRank() {
return rank;
}
public String getSuitString() {
// Return a String representing the card's suit.
// (If the card's suit is invalid, "??" is returned.)
switch ( suit ) {
case SPADES: return "Spades";
case HEARTS: return "Hearts";
case DIAMONDS: return "Diamonds";
case CLUBS: return "Clubs";
default: return "I don't even know";
}
}
public String getRankString() {
switch ( rank ) {
case 1: return "Ace";
case 2: return "2";
case 3: return "3";
case 4: return "4";
case 5: return "5";
case 6: return "6";
case 7: return "7";
case 8: return "8";
case 9: return "9";
case 10: return "10";
case 11: return "Jack";
case 12: return "Queen";
case 13: return "King";
default: return "This is impossible!";
}
}
@Override
public String toString() {
return getRankString() + " of " + getSuitString();
}
}
package blackjack;
public class Deck {
private Card[] deck;
private int cardsUsed;
public Deck() {
deck = new Card[52];
int l = 0;
for ( int suit = 0; suit <= 3; suit++ ) {
for ( int value = 1; value <= 13; value++ ) {
deck[l] = new Card(value,suit);
l++;
}
}
cardsUsed = 0;
}
public void shuffle() {
for ( int i = 51; i > 0; i-- ) {
int rand = (int)(Math.random()*(i+1));
Card temp = deck[i];
deck[i] = deck[rand];
deck[rand] = temp;
}
cardsUsed = 0;
}
public int cardsLeft() {
return 52 - cardsUsed;
}
public Card dealCard() {
if (cardsUsed == 52){
shuffle();}
cardsUsed++;
return deck[cardsUsed - 1];
}
}
package blackjack;
import java.util.*;
public class Hand {
private ArrayList hand;
public Hand() {
hand = new ArrayList();
}
public void clear() {
hand.clear();
}
public void addCard(Card c) {
if (c != null){
hand.add(c);
}
}
public void removeCard(Card c) {
hand.remove(c);
}
public void removeCard(int location) {
if (location >= 0 && location < hand.size()){
hand.remove(location);
}
}
public int getCardCount() {
return hand.size();
}
public Card getCard(int location) {
if (location >= 0 && location < hand.size()){
return (Card)hand.get(location);}
else{
return null;
}
}
public void sortBySuit() {
ArrayList newHand = new ArrayList();
while (hand.size() > 0) {
int pos = 0;
Card c = (Card)hand.get(0);
for (int i = 1; i < hand.size(); i++) {
Card c1 = (Card)hand.get(i);
if ( c1.getSuit() < c.getSuit() ||
(c1.getSuit() == c.getSuit() && c1.getRank() < c.getRank()) ) {
pos = i;
c = c1;
}
}
Object remove = hand.remove(pos);
newHand.add(c);
}
hand = newHand;
}
public int getBlackjackValue() {
int val;
boolean ace;
int cards;
val = 0;
ace = false;
cards = getCardCount();
for ( int i = 0; i < cards; i++ ) {
Card card;
int cardVal;
card = getCard(i);
cardVal = card.getRank();
if (cardVal > 10) {
cardVal = 10;
}
if (cardVal == 1) {
ace = true;
}
val = val + cardVal;
}
if ( ace == true && val + 10 <= 21 ){
val = val + 10;
}
return val;
}
}
答案 0 :(得分：3)
这是不可能的，因为您没有向我们展示相关代码。但是，如果您的结果不是随机的，那可能是因为Deck.dealCard()不是随机的。
<强>更新
阅读您发布的新代码后。创建它之后，你不会洗牌。
答案 1 :(得分：0)
这不是随机的，因为Deck::dealCard()不是随机的。
答案 2 :(得分：0)
dealCard很奇怪：当创建一个新的Deck时，cardsUsed为0，但只有当cardsUsed为52时才会进行洗牌。
public Card dealCard() {
if (cardsUsed == 52){
shuffle();}
cardsUsed++;
return deck[cardsUsed - 1];
}
我认为你应该在构建甲板之后立即将调用移动到构造函数。