无法使卡片/卡片组对象程序工作

Question

这是我第一次在论坛上发帖，我不完全确定我的问题是否有效，但我会尽量具体并遵循指南。根据指导原则，这是一个基于课堂作业的问题。这项任务是获取创建一个"牌组"对象的代码，该对象表示一副牌，并添加几个功能。我目前被困在这个过程中。

我的问题在于这个代码：

public class SilasAlmgrenS6L1CardCreate {
public static void main(String args[]) {
Deck d = new Deck();
d.shuffle();
Hand f = new Hand(d); //Returns error 'Hand cannot be resolved to a type'
}
public static class Deck {
Card[] cardArray = new Card[52];
Deck() { //constructor
int suits = 4;
int cardType = 13;
int cardCount = 0;
for (int i = 1; i <= suits; i++)
for (int j = 1; j <= cardType; j++) {
cardArray[cardCount] = new Card(i, j);
cardCount++;
} //End loop
} //End deck() constructor

////////////////////////////////////////////////////////
//My code starts here
public class Hand {
Hand(Deck a) {
Card[] Hand = {a.cardArray[0], a.cardArray[1], a.cardArray[2], a.cardArray[3], a.cardArray[4]};
Card[] playerHand = {Hand[0], Hand[1]};
System.out.println("You have " + playerHand[0] + " and " + playerHand[1] );
} //End hand constructor
} //End hand class
public void shuffle() {
//Runs loop for the length of the deck
for(int i = 0; i < cardArray.length; i++) {
int num = (int) (Math.random() * (51 - 0)) + 0; //Creates a random number between 0 and 51; used to shuffle
Card placeHolder = cardArray[i]; //Picks a place holder card from the deck
cardArray[i] = cardArray[num]; //Picks two random cards and make them equal
cardArray[num] = placeHolder; //Assigns one of the duplicate cards to the placeholder value 
} //End for
} //End shuffle

//And ends here
/////////////////////////////////////////////////

public void print() {
for (int i = 0; i < cardArray.length; i++)
System.out.println(cardArray[i]);
} //End print loop
} //End print class

public static class Card {
String suit, name;
int points;
Card(int n1, int n2) {
suit = getSuit(n1);
name = getName(n2);
points = getPoints(name);
} //End card class
public String toString() {
return "The " + name + " of " + suit;
} //End toString
public String getName(int i) {
if (i == 1) return "Ace";
if (i == 2) return "Two";
if (i == 3) return "Three";
if (i == 4) return "Four";
if (i == 5) return "Five";
if (i == 6) return "Six";
if (i == 7) return "Seven";
if (i == 8) return "Eight";
if (i == 9) return "Nine";
if (i == 10) return "Ten";
if (i == 11) return "Jack";
if (i == 12) return "Queen";
if (i == 13) return "King";
return "error";
} //End getName String
public int getPoints(String n) {
if (n == "Jack" || n == "Queen" || n == "King" || n == "Ten")
return 10;
if (n == "Two")
return 2;
if (n == "Three")
return 3;
if (n == "Four")
return 4;
if (n == "Five")
return 5;
if (n == "Six")
return 6;
if (n == "Seven")
return 7;
if (n == "Eight")
return 8;
if (n == "Nine")
return 9;
if (n == "Ace")
return 11;
return -1;
} //End int getPoints
public String getSuit(int i) {
if (i == 1) return "Diamonds";
if (i == 2) return "Clubs";
if (i == 3) return "Spades";
if (i == 4) return "Hearts";
return "error";
} //End getSuit String        
} //End Deck class

}

这个程序的大部分已经提供了任务，但我们将添加几个功能。这些功能中的第一个是洗牌方法，我能够做到这一点。在下一个功能中，我们将创建一个"Hand"类，该类将一手牌交给用户，并计算他们的点数，就像21点游戏一样。这一步的确切措辞是：

'添加一个包含5个卡引用数组的手牌类。让程序"发牌"两张牌，并向用户展示。告诉用户他们有多少积分，并询问他们是否想要另一张卡。继续允许玩家添加牌，直到达到5张牌或总数大于21张

我已经试过几种我觉得可以创建这个类的方法，但似乎都不起作用。当前的迭代是我所得到的最接近的迭代。然而，我目前被难住了。我的问题是；我不知道为什么在尝试使用Hand类时会出现类型错误，而且我不知道如何实现getPoints()方法。创建Hand类之后有几个步骤，但如果我能弄清楚如何使这个类工作，我相信我能完成这些步骤。我即将在墙上打一个洞，所以如果能帮我修复这个代码，我将不胜感激。

Answer 1

第一个问题是Hand类是静态Deck类的子类。这样就不能在main方法中使用它，因为它不是封闭类。

编辑

所以，我在这里有点过火了。希望这对你有意义。

首先，我们有你们的主课。我改名是为了不想打那么长的名字。我添加了您的Hand和Deck对象作为变量，因为Hand既不属于Deck，也不属于其他类型，但它们都是Main类的一部分，让我们将其称为游戏。

你从洗牌开始。当你有牌组时，你可以得到一张随机的牌。这是由甲板提供的。(我很快就会谈到这个方法)。

一旦你有手，你就可以向用户显示他们的积分数量，并询问他们是否想要一张额外的卡(如果numberOfPoints<22和numberOfCards<5)。如果他们真的想要一张额外的牌，可以向牌组索要一张随机的牌，并将其添加到手牌中。继续，直到达到任何边界。

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class CardExample {
private Hand playHand;
private Deck playDeck;
private Scanner reader = new Scanner(System.in);  // Reading from System.in

public static void main(String args[]) {
new CardExample().play();
}
public void play(){
playDeck = new Deck();
playDeck.shuffle();
Card firstCard = playDeck.getRandomCard();
Card secondCard = playDeck.getRandomCard();
List<Card> startCards = new ArrayList<>();
startCards.add(firstCard);
startCards.add(secondCard);
playHand = new Hand(startCards);
requestInput();
}
private void requestInput(){
System.out.println("You have " + playHand.getPoints() + " points");
System.out.println("New card? (Y/N)");
String input = reader.next();
if(input.equalsIgnoreCase("y")){
Card newCard = playDeck.getRandomCard();
playHand.addCard(newCard);
if(playHand.getNumberOfCards() < 5 && playHand.getPoints() < 22) {
requestInput();
}else if(playHand.getPoints() >= 22){
System.out.println("You have " + playHand.getPoints() + "points. You're dead, sorry.");
reader.close();
} else{
System.out.println("You have 5 cards, that's the max");
reader.close();
}
}else{
System.out.println("Your score is " + playHand.getPoints() + " points");
reader.close();
}
}
}

甲板级

public class Deck {
private Card[] cardArray = new Card[52];
private int currentIndex = 0;
public Deck() { //constructor
int suits = 4;
int cardType = 13;
int cardCount = 0;
for (int i = 1; i <= suits; i++)
for (int j = 1; j <= cardType; j++) {
cardArray[cardCount] = new Card(i, j);
cardCount++;
} //End loop
}
public void shuffle() {
//Runs loop for the length of the deck
for(int i = 0; i < cardArray.length; i++) {
int num = (int) (Math.random() * (51 - 0)) + 0; //Creates a random number between 0 and 51; used to shuffle
Card placeHolder = cardArray[i]; //Picks a place holder card from the deck
cardArray[i] = cardArray[num]; //Picks two random cards and make them equal
cardArray[num] = placeHolder; //Assigns one of the duplicate cards to the placeholder value
} //End for
} //End shuffle
public Card[] getCardArray() {
return cardArray;
}
public Card getRandomCard(){
Card nextCard = cardArray[currentIndex];
currentIndex += 1;
return nextCard;
}

//And ends here
/////////////////////////////////////////////////

public void print() {
for (int i = 0; i < cardArray.length; i++)
System.out.println(cardArray[i]);
} //End print loop
}

手工类addCard更新积分，以便无论何时获得卡数或积分，都会返回正确的值

import java.util.ArrayList;
import java.util.List;
public class Hand {
private int points = 0;
private int numberOfCards = 0;
private List<Card> hand = new ArrayList<>();

public Hand(List<Card> cards) {
hand.addAll(cards);
numberOfCards += cards.size();
for(Card card: cards){
points += card.points;
}
} //End hand constructor
public void addCard(Card card){
hand.add(card);
points += card.points;
numberOfCards += 1;
}
public int getNumberOfCards() {
return numberOfCards;
}
public int getPoints() {
return points;
}

}

卡片类(不变，但单独的文件)

public class Card {
String suit, name;
int points;
Card(int n1, int n2) {
suit = getSuit(n1);
name = getName(n2);
points = getPoints(name);
} //End card class
public String toString() {
return "The " + name + " of " + suit;
} //End toString
public String getName(int i) {
if (i == 1) return "Ace";
if (i == 2) return "Two";
if (i == 3) return "Three";
if (i == 4) return "Four";
if (i == 5) return "Five";
if (i == 6) return "Six";
if (i == 7) return "Seven";
if (i == 8) return "Eight";
if (i == 9) return "Nine";
if (i == 10) return "Ten";
if (i == 11) return "Jack";
if (i == 12) return "Queen";
if (i == 13) return "King";
return "error";
} //End getName String
public int getPoints(String n) {
if (n == "Jack" || n == "Queen" || n == "King" || n == "Ten")
return 10;
if (n == "Two")
return 2;
if (n == "Three")
return 3;
if (n == "Four")
return 4;
if (n == "Five")
return 5;
if (n == "Six")
return 6;
if (n == "Seven")
return 7;
if (n == "Eight")
return 8;
if (n == "Nine")
return 9;
if (n == "Ace")
return 11;
return -1;
} //End int getPoints
public String getSuit(int i) {
if (i == 1) return "Diamonds";
if (i == 2) return "Clubs";
if (i == 3) return "Spades";
if (i == 4) return "Hearts";
return "error";
} //End getSuit String
} //End Deck class