运行代码时出现不兼容的类型错误。当“ playerGuess = d1.deal（）;”时
在此先感谢您。这个主体还有另外两个类。 DeckOfCards和Cards类。
卡类
public class Card
{
public final static int ACE = 1;
public final static int TWO = 2;
public final static int THREE = 3;
public final static int FOUR = 4;
public final static int FIVE = 5;
public final static int SIX = 6;
public final static int SEVEN = 7;
public final static int EIGHT = 8;
public final static int NINE = 9;
public final static int TEN = 10;
public final static int JACK = 11;
public final static int QUEEN = 12;
public final static int KING = 13;
public final static int CLUBS = 1;
public final static int DIAMONDS = 2;
public final static int HEARTS = 3;
public final static int SPADES = 4;
private final static int NUM_FACES = 13;
private final static int NUM_SUITS = 4;
private int face, suit;
private String faceName, suitName;
//-----------------------------------------------------------------
// Creates a random card.
//-----------------------------------------------------------------
public Card()
{
face = (int) (Math.random() * NUM_FACES) + 1;
setFaceName();
suit = (int) (Math.random() * NUM_SUITS) + 1;
setSuitName();
}
//-----------------------------------------------------------------
// Creates a card of the specified suit and face value.
//-----------------------------------------------------------------
public Card(int faceValue, int suitValue)
{
face = faceValue;
setFaceName();
suit = suitValue;
setSuitName();
}
//-----------------------------------------------------------------
// Sets the string representation of the face using its stored
// numeric value.
//-----------------------------------------------------------------
private void setFaceName()
{
switch (face)
{
case ACE:
faceName = "Ace";
break;
case TWO:
faceName = "Two";
break;
case THREE:
faceName = "Three";
break;
case FOUR:
faceName = "Four";
break;
case FIVE:
faceName = "Five";
break;
case SIX:
faceName = "Six";
break;
case SEVEN:
faceName = "Seven";
break;
case EIGHT:
faceName = "Eight";
break;
case NINE:
faceName = "Nine";
break;
case TEN:
faceName = "Ten";
break;
case JACK:
faceName = "Jack";
break;
case QUEEN:
faceName = "Queen";
break;
case KING:
faceName = "King";
break;
}
}
//-----------------------------------------------------------------
// Sets the string representation of the suit using its stored
// numeric value.
//-----------------------------------------------------------------
private void setSuitName()
{
switch (suit)
{
case CLUBS:
suitName = "Clubs";
break;
case DIAMONDS:
suitName = "Diamonds";
break;
case HEARTS:
suitName = "Hearts";
break;
case SPADES:
suitName = "Spades";
break;
}
}
//-----------------------------------------------------------------
// Determines if this card is higher than the passed card. The
// second parameter determines if aces should be considered high
// (beats a King) or low (lowest of all cards). Uses the suit
// if both cards have the same face.
//-----------------------------------------------------------------
public boolean isHigherThan(Card card2, boolean aceHigh)
{
boolean result = false;
if (face == card2.getFace())
{
if (suit > card2.getSuit())
result = true;
}
else
{
if (aceHigh && face == ACE)
result = true;
else
if (face > card2.getFace())
result = true;
}
return result;
}
//-----------------------------------------------------------------
// Determines if this card is higher than the passed card,
// assuming that aces should be considered high.
//-----------------------------------------------------------------
public boolean isHigherThan(Card card2)
{
return isHigherThan(card2, true);
}
//-----------------------------------------------------------------
// Returns the face (numeric value) of this card.
//-----------------------------------------------------------------
public int getFace()
{
return face;
}
//-----------------------------------------------------------------
// Returns the suit (numeric value) of this card.
//-----------------------------------------------------------------
public int getSuit()
{
return suit;
}
//-----------------------------------------------------------------
// Returns the face (string value) of this card.
//-----------------------------------------------------------------
public String getFaceName()
{
return faceName;
}
//-----------------------------------------------------------------
// Returns the suit (string value) of this card.
//-----------------------------------------------------------------
public String getSuitName()
{
return suitName;
}
//-----------------------------------------------------------------
// Returns the string representation of this card, including
// both face and suit.
//-----------------------------------------------------------------
public String toString()
{
return faceName + " of " + suitName;
}
}
卡片组类
public class DeckOfCards
{
private Card[] myCardDeck;
private int nowCard;
public DeckOfCards( ) {
myCardDeck = new Card[ 52 ];
int i = 0;
for ( int suit = Card.SPADES; suit <= Card.DIAMONDS; suit++ )
for ( int pos = 1; pos <= 13; pos++ )
myCardDeck[i++] = new Card(suit, pos);
nowCard = 0;
}
public void shuffle(int n)
{
int i, j, k;
for ( k = 0; k < n; k++ )
{
i = (int) ( 52 * Math.random() );
j = (int) ( 52 * Math.random() );
Card tmp = myCardDeck[i];
myCardDeck[i] = myCardDeck[j];
myCardDeck[j] = tmp;;
}
nowCard = 0;
}
public Card deal()
{
if ( nowCard < 52 )
{
return ( myCardDeck[ nowCard++ ] );
}
else
{
System.out.println("No Cards BRUH");
return ( null );
}
}
public String toString()
{
String s = "";
int Q = 0;
for ( int i = 0; i < 4; i++ )
{
for ( int j = 1; j <= 13; j++ )
s += (myCardDeck[Q++] + " ");
s += "\n";
}
return ( s );
}
public int deckSize()
{
for(int z =0; z < myCardDeck.length && z < 52; z++);
return myCardDeck.length;
}
}
主驱动程序类（HighLow）
import java.util.*;
public class HighLow
{
public static void main (String [] args)
{
DeckOfCards d1 = new DeckOfCards();
Scanner scan = new Scanner(System.in);
String playerGuess;
Card firstDeal, secondDeal;
int count =0;
d1.shuffle(1);
firstDeal = d1.deal();
while(true)
{
if(d1.deckSize() == 0);
{
System.out.print("Game over! Score: " + count);
break;
}
System.out.print(firstDeal);
System.out.print("Guess if next card will be a high card, or a low card!");
System.out.print("Use H or L");
playerGuess = d1.deal();
if(secondDeal.isHigherThan(firstDeal)&&playerGuess.equals("H"))
{
System.out.print("Nice!!!!");
count++;
firstDeal=secondDeal;
}
else if(firstDeal.isHigherThan(secondDeal) && playerGuess.equals("L"))
{
System.out.println("NICE!!!!");
count++;
firstDeal = secondDeal;
}
else if (firstDeal.isHigherThan(secondDeal) && playerGuess.equals("L"))
{
System.out.print("Good Job!!!!");
count++;
firstDeal = secondDeal;
}
else
{
System.out.println("Sorry, the game is over. But your score is! " + count);
break;
}
}
}}
谢谢！
最佳答案
方法deal()返回Card：
public Card deal() { ... }
变量
playerGuess是String：String playerGuess;
您不能将
Card分配给String：playerGuess = d1.deal(); // incompatible types
看起来您想要
playerGuess存储用户输入，因此应为：playerGuess = scan.next();