这是我整个计划的一小部分，由4个班级组成。类的目标是打印出具有数值和适合度的卡，用户比继续猜测下一张卡具有更高的数值。如果卡片相同，则套装方法按顺序确定最大套装// SPADES＆gt;＆gt;＆gt;＆gt; HEARTS＆gt;＆gt;＆gt;＆gt; CLUBS＆gt;＆gt;＆gt;＆gt; DIAMONDS（如卡片方法所示）。然而，问题出现在我的HighLowrev类中，在do while循环中，因为要求用户再次播放，如果用户以'y'响应，则程序继续，即使用户以'n'响应，程序也会继续。我已经尝试了查看布尔的进一步用法，但已经意识到我很确定它们是这样工作的。任何帮助将非常感激。
CARD CLASS
public class Card {
// card class initalize varibles (NOtice the FINAL (THEY NEVER CHANGE VALUE!!!))
public final static int SPADES = 3; // Codes for the 4 suits, plus Joker.
public final static int HEARTS = 2;
public final static int DIAMONDS = 0;
public final static int CLUBS = 1;
public final static int JOKER = 4;
// SPADES >>>> HEARTS >>>> CLUBS >>>> DIAMONDS
public final static int ACE = 1; // Codes for the non-numeric cards.
public final static int JACK = 11; // Cards 2 through 10 have their
public final static int QUEEN = 12; // numerical values for their codes.
public final static int KING = 13;
private final int suit;
private final int value;
public static void main (String [] args){
} // joker constructor
public Card() {
suit = JOKER;
value = 1;
}
// incase an illegal field occurs
public Card(int theValue, int theSuit) {
if (theSuit != SPADES && theSuit != HEARTS && theSuit != DIAMONDS &&
theSuit != CLUBS && theSuit != JOKER)
throw new IllegalArgumentException("Illegal playing card suit");
if (theSuit != JOKER && (theValue < 1 || theValue > 13))
throw new IllegalArgumentException("Illegal playing card value");
value = theValue;
suit = theSuit;
}
public int getSuit() {
return suit;
}
// getter methods
public int getValue() {
return value;
}
// cases for suits...
public String getSuitAsString() {
switch ( suit ) {
case SPADES: return "Spades";
case HEARTS: return "Hearts";
case DIAMONDS: return "Diamonds";
case CLUBS: return "Clubs";
default: return "Joker";
}
}
// cases for numerical values...
public String getValueAsString() {
if (suit == JOKER)
return "" + value;
else {
switch ( value ) {
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";
default: return "King";
}
}
}
public String toString() {
if (suit == JOKER) {
if (value == 1)
return "Joker"; // if the suit is the joker ....
else
return "Joker #" + value;
}
else { // return suit and number
return getValueAsString() + " of " + getSuitAsString() ;
}
}
}
主程序类
import java.io.*;
public class HighLowrev {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader (new InputStreamReader (System.in)); // allow input
System.out.println("This program lets you play the simple card game,");
System.out.println("HighLow. A card is dealt from a deck of cards.");
System.out.println("You have to predict whether the next card will be");
System.out.println("higher or lower. Your score in the game is the");
System.out.println("number of correct predictions you make before");
System.out.println("you guess wrong.");
System.out.println();
int gamesPlayed = 0; // Number of games user has played.
int sumOfScores = 0; // The sum of all the scores from
// all the games played.
double averageScore; // Average score, computed by dividing
// sumOfScores by gamesPlayed.
boolean playAgain = true;; // Record user's response when user is
// asked whether he wants to play
// another game.
do {
int scoreThisGame; // Score for one game.
scoreThisGame = play(); // Play the game and get the score.
sumOfScores += scoreThisGame;
gamesPlayed++;
System.out.print("Play again? ");
String input = br.readLine();
if(input== "Y" || input =="y") {
playAgain = true;
}
else {
playAgain =false;
}
} while (playAgain=true);
averageScore = ((double)sumOfScores) / gamesPlayed;
System.out.println();
System.out.println("You played " + gamesPlayed + " games.");
System.out.printf("Your average score was %1.3f.\n", averageScore);
} // end main()
private static int play() throws IOException {
BufferedReader br = new BufferedReader (new InputStreamReader (System.in)); // allow input
Deck deck = new Deck(); // Get a new deck of cards, and
Card currentCard; // The current card, which the user sees.
Card nextCard; // The next card in the deck. The user tries
int correctGuesses ; // The number of correct predictions the
char guess; // The user's guess. 'H' if the user predicts that
deck.shuffle(); // Shuffle the deck into a random order before
correctGuesses = 0;
currentCard = deck.dealCard();
System.out.println("The first card is the " + currentCard);
while (true) { // Loop ends when user's prediction is wrong.
/* Get the user's prediction, 'H' or 'L' (or 'h' or 'l'). */
System.out.println("Will the next card be higher (H) or lower (L)? ");
do { /// THE SECTION HERE IS THE SPECIFIED PROBLEM, THE IF AND ELSE STATEMENTS DONT DO ANYTHING!
guess = (char)br.read();
guess = Character.toUpperCase(guess);
if (guess != 'H' && guess != 'L')
System.out.println("Please respond with H or L: ");
} while (guess != 'H' && guess != 'L');
nextCard = deck.dealCard();
System.out.println("The next card is " + nextCard);
if(nextCard.getValue() == currentCard.getValue()) {
if(guess == 'H') {
if(nextCard.getSuit() > currentCard.getSuit()) {
System.out.println("Your prediction was correct.");
correctGuesses++;
}
}
else {
System.out.println("Your prediction was incorrect.");
break; // End the game.
}
if(guess == 'L') {
if(nextCard.getSuit() < currentCard.getSuit()) {
System.out.println("Your prediction was correct.");
correctGuesses++;
}
}
else {
System.out.println("Your prediction was incorrect.");
break;
}
}
else if (nextCard.getValue() > currentCard.getValue()) {
if (guess == 'H') {
System.out.println("Your prediction was correct.");
correctGuesses++;
}
else {
System.out.println("Your prediction was incorrect.");
break; // End the game.
}
}
else { // nextCard is lower
if (guess == 'L') {
System.out.println("Your prediction was correct.");
correctGuesses++;
}
else {
System.out.println("Your prediction was incorrect.");
break; // End the game.
}
}
currentCard = nextCard;
System.out.println();
System.out.println("The card is " + currentCard);
} // end of while loop
System.out.println();
System.out.println("The game is over.");
System.out.println("You made " + correctGuesses
+ " correct predictions.");
System.out.println();
return correctGuesses;
}
}
答案 0 :(得分：4)
String比较不是==，而是String#equals
即代替
if(input== "Y" || input =="y") {
你应该使用更像......的东西。
if("Y".equalsIgnoreCase(input)) {
<强>更新...
true到playAgain
} while (playAgain=true);
这会将true分配回playAgain，这意味着永远不会退出循环。尝试使用像...这样的东西。
} while (playAgain);
...代替
答案 1 :(得分：2)
您要比较的变量input是一个字符串。
无法使用==来区分字符串，您必须使用String#equals()
==运算符检查对象的引用是否相等。 See this post
在这种情况下，您可能需要使用String#equalsIgnoreCase()
同样如上所述，您需要修复while (playAgain=true);这是真正的变量playAgain，并且始终为true，在这里您要使用==或仅使用变量本身（不需要）比较布尔值）
答案 2 :(得分：0)
while（playAgain = true）;
应该是while（playAgain == true）; ？
比较运算符不正确。