无法使 card/deck 目标程序运行
Cannot get card/deck object program to work
这是我第一次在论坛上发帖，我不确定我的问题是否有效，但我会尽量具体并遵循指南。按照指南，这是一个基于 class 作业的问题。此作业是采用代码来创建代表一副纸牌的 'deck' 对象并添加几个功能。我目前卡在这个过程中。
我的问题出在这段代码中：
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
}
该程序的大部分内容已随作业一起提供，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。在下一个功能中，我们将创建一个 'Hand' class 来向用户发一手牌并计算他们有多少点数，就像玩二十一点游戏一样。
这一步的准确写法是：
'Add a Hand Class that contains an array of 5 Card references. Have the program Deal the Hand two cards and display them for the user. Tell the user how many points they have and ask them if they would like another card or not. Continue to allow the player to add cards until they reach 5 cards or the total is greater than 21.'
我 运行 通过几种我认为可以创建此 class 的方法，但 none 似乎有效。当前的迭代与我所获得的一样接近。然而，我现在很困惑。我的问题是；我不知道为什么当我尝试使用 Hand class 时出现类型错误，而且我不知道如何实现 getPoints() 方法。创建 Hand class 之后有几个步骤，但如果我能弄清楚如何使这个 class 工作，我相信我可以完成这些步骤。我正处于在墙上打洞的边缘，因此非常感谢任何修复此代码的帮助。
第一个问题是您的 Hand class 是静态 Deck class 的子class。这样你就不能在你的 main 方法中使用它，因为那不是封闭的 class.
编辑
所以，我在这里有点过火了。希望它对你有意义。
首先，我们有您的主要 class。为了不想输入那么长的名字，我重命名了它。我添加了你的 Hand 和 Deck 对象作为变量，因为 Hand 不属于 Deck 或相反，但它们都是 Main class 的一部分，让我们将其称为游戏。
您首先洗牌。当你有套牌时，你可以随机得到一张牌。这是由甲板提供的。 （我很快就会谈到那个方法）。
只要您有一手牌，您就可以向用户显示他们拥有的点数，并询问他们是否想要一张额外的牌（如果 numberOfPoints < 22 且 numberOfCards < 5）。如果他们确实想要一张额外的牌，请向牌组要一张随机牌并将其添加到手上。继续，直到满足任何边界。
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class
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class
addCard 更新积分，以便每当获得 numberOfCards 或积分时，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class（未更改，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
这是我第一次在论坛上发帖，我不确定我的问题是否有效，但我会尽量具体并遵循指南。按照指南，这是一个基于 class 作业的问题。此作业是采用代码来创建代表一副纸牌的 'deck' 对象并添加几个功能。我目前卡在这个过程中。
我的问题出在这段代码中：
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
}
该程序的大部分内容已随作业一起提供，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。在下一个功能中，我们将创建一个 'Hand' class 来向用户发一手牌并计算他们有多少点数，就像玩二十一点游戏一样。 这一步的准确写法是：
'Add a Hand Class that contains an array of 5 Card references. Have the program Deal the Hand two cards and display them for the user. Tell the user how many points they have and ask them if they would like another card or not. Continue to allow the player to add cards until they reach 5 cards or the total is greater than 21.'
我 运行 通过几种我认为可以创建此 class 的方法，但 none 似乎有效。当前的迭代与我所获得的一样接近。然而，我现在很困惑。我的问题是；我不知道为什么当我尝试使用 Hand class 时出现类型错误，而且我不知道如何实现 getPoints() 方法。创建 Hand class 之后有几个步骤，但如果我能弄清楚如何使这个 class 工作，我相信我可以完成这些步骤。我正处于在墙上打洞的边缘，因此非常感谢任何修复此代码的帮助。
第一个问题是您的 Hand class 是静态 Deck class 的子class。这样你就不能在你的 main 方法中使用它，因为那不是封闭的 class.
编辑
所以，我在这里有点过火了。希望它对你有意义。
首先，我们有您的主要 class。为了不想输入那么长的名字，我重命名了它。我添加了你的 Hand 和 Deck 对象作为变量，因为 Hand 不属于 Deck 或相反，但它们都是 Main class 的一部分，让我们将其称为游戏。
您首先洗牌。当你有套牌时，你可以随机得到一张牌。这是由甲板提供的。 （我很快就会谈到那个方法）。
只要您有一手牌，您就可以向用户显示他们拥有的点数，并询问他们是否想要一张额外的牌（如果 numberOfPoints < 22 且 numberOfCards < 5）。如果他们确实想要一张额外的牌，请向牌组要一张随机牌并将其添加到手上。继续，直到满足任何边界。
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class
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class
addCard 更新积分，以便每当获得 numberOfCards 或积分时，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class（未更改，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