在卡类中找不到符号

Question

这里我创建了一个Card类，它为一张牌提供了一个suit和rank值。我还创建了一个子牌组类，它提供52张牌，一张标准扑克牌，一种洗牌方法、发牌方法、报告方法(报告牌组中剩余的数字(和toString方法。当我尝试制作一副新牌时，我的问题就出在我的牌组课上。我从甲板类收到这个错误：

Deck.java:12: error: cannot find symbol
for (int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++)               
symbol:   variable DIAMONDS
location: class Card
Deck.java:12: error: cannot find symbol
for (int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++)
symbol:   variable SPADES

我尝试将Card.DIAMONDS更改为Suit.DIAMONDS，但这又给了我一个错误。关于我的问题是用什么方法解决的，我们将不胜感激。这对我来说是一次学习经历，所以我喜欢指导而不是确切的解决方案。

enum Suit {
HEARTS, DIAMONDS, CLUBS, SPADES
};
enum Rank {
ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING
};
public class Card {
private Rank aRank;
private Suit aSuit;
public Card(Suit aSuit, Rank aRank) {
this.aSuit = aSuit;
this.aRank = aRank;
}
public Rank getRank() {
return aRank;
}
public Suit getSuit() {
return aSuit;
}
public String toString() {
String cardValue = "";
String rank = "";
String suit = "";
switch (aSuit) {
case HEARTS:
suit = "hearts";
break;
case DIAMONDS:
suit = "diamonds";
break;
case CLUBS:
suit = "clubs";
break;
case SPADES:
suit = "spades";
break;
}
switch (aRank) {
case ACE:
rank = "Ace";
break;
case TWO:
rank = "2";
break;
case THREE:
rank = "3";
break;
case FOUR:
rank = "4";
break;
case FIVE:
rank = "5";
break;
case SIX:
rank = "6";
break;
case SEVEN:
rank = "7";
break;
case EIGHT:
rank = "8";
break;
case NINE:
rank = "9";
break;
case TEN:
rank = "10";
break;
case JACK:
rank = "Jack";
break;
case QUEEN:
rank = "Queen";
break;
case KING:
rank = "King";
break;
}
cardValue += rank + " of " + suit;
return cardValue;
}
public int compareTo(Card other) {
int rankComparison = aRank.compareTo(other.aRank);
return rankComparison != 0 ? rankComparison : aSuit.compareTo(other.aSuit);
}
public boolean equals(Card other) {
if (aRank == other.aRank)
return true;
if (aSuit == other.aSuit)
return true;
return false;
}
// Main method to test.
public static void main(String[] args) {
Card c1 = new Card(Suit.SPADES, Rank.FIVE);
Card c2 = new Card(Suit.HEARTS, Rank.TWO);
Card c3 = new Card(Suit.CLUBS, Rank.EIGHT);
Card c4 = new Card(Suit.DIAMONDS, Rank.FIVE);
Card r1 = new Card(Suit.CLUBS, Rank.ACE);
Card r2 = new Card(Suit.DIAMONDS, Rank.JACK);
Card r3 = new Card(Suit.HEARTS, Rank.QUEEN);
Card r4 = new Card(Suit.SPADES, Rank.KING);
System.out.println(c1);
System.out.println(c2);
System.out.println(c3);
if (c1.compareTo(c2) < 0)
System.out.println(c2 + " outranks " + c1);
else if (c1.compareTo(c2) > 0)
System.out.println(c1 + " outranks " + c2);
if (c1.compareTo(c3) < 0)
System.out.println(c3 + " outranks " + c1);
else if (c1.compareTo(c3) > 0)
System.out.println(c1 + " outranks " + c3);
if (c1.compareTo(c1) == 0)
System.out.println(c1 + " is equal to " + c1);
else
System.out.println(c1 + " is NOT equal to " + c1);
if (c1.equals(c4))
System.out.println(c1 + " is equal to " + c4);
else
System.out.println(c1 + " is NOT equal to " + c4);
if (r1.compareTo(r2) < 0)
System.out.println(r1 + " comes before " + r2);
else if (r1.compareTo(r2) > 0)
System.out.println(r1 + " comes after " + r2);
else
System.out.println(r1 + " is equal to " + r2);
if (r4.compareTo(r3) < 0)
System.out.println(r4 + " comes before " + r3);
else if (r4.compareTo(r3) > 0)
System.out.println(r4 + " comes after " + r3);
else
System.out.println(r4 + " is equal to " + r3);
}
}

我的甲板等级：

import java.lang.reflect.Array;
import java.util.*;
public class Deck{
public static final int NEWCARDS = 52;
private Card[] deckOfCards;        
private int currentCard;           
public void Deck( ) {
deckOfCards = new Card[ NEWCARDS ];
int i = 0;
for (int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++)
for ( int rank = 1; rank <= 13; rank++ )
deckOfCards[i++] = new Card(suit, rank);
currentCard = 0;
}
public void shuffle(int n) {
int i, j, k;
for ( k = 0; k < n; k++ ){ 
i = (int) ( NEWCARDS * Math.random() );  
j = (int) ( NEWCARDS * Math.random() );  
Card temp = deckOfCards[i];
deckOfCards[i] = deckOfCards[j];
deckOfCards[j] = temp;
}
currentCard = 0;   
}
public Card deal() {
if (currentCard < NEWCARDS) {
return ( deckOfCards[currentCard++] );
}
else{
System.out.println("Out of cards error");
return ( null );  
}
}
public String toString() {
String s = "";
int k;
k = 0;
for ( int i = 0; i < 4; i++ ) {        
for ( int j = 1; j <= 13; j++ )
s += (deckOfCards[k++] + " ");
s += "n";
}
return (s);
}
}

Answer 1

enum不是类的一部分。它也不是int。更改

for (int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++)

访问Suit，并且需要ordinal()分配给int。类似的东西

for (int suit = Suit.DIAMONDS.ordinal(); suit <= Suit.SPADES.ordinal(); suit++) {
Suit s = Suit.values()[suit];
// ...
}