我正在创建一个Hangman游戏，我在存储和处理用户之前的猜测时遇到了麻烦。我想存储它们，并且如果用户猜测先前猜到的字符，则会弹出一条消息并提示他们重新输入另一个字符。我该如何处理这个问题？
以下是我的代码，如果它有帮助：
import java.util.Scanner;
import java.util.Random;
public class HangmanAssignment
{
static Scanner numIn = new Scanner(System.in);
static Scanner strIn = new Scanner(System.in);
// Used to hold the user's previous guesses into a string.
static StringBuffer buffer = new StringBuffer();
public static void main(String[] args)
{
String category, word, displayWord = "";
int wordLength, position, lettersRemaining, totalLives = 10;
boolean isGuessInWord;
StringBuffer prevGuessedLetters;
char guess;
category = getCategory();
word = getWord(category);
// Gets the length of the word.
wordLength = word.length();
lettersRemaining = wordLength;
System.out.println("The length of your word is: " + wordLength + " characters.");
// Generates as many '-' as long as word's length and stores it in 'displayWord'.
for (int i = 0; i < wordLength; i++)
{
displayWord += "-";
// System.out.println(displayWord); /* Testing */
}
while (lettersRemaining > 0 && totalLives > 0)
{
// Prompts user to guess a letter.
System.out.println("Guess a letter (Note: there are " + wordLength + " letters)");
guess = strIn.findWithinHorizon(".", 0).charAt(0);
// Checks if the letter guessed in within 'word'.
isGuessInWord = (word.indexOf(guess)) != -1;
// Checks if the guess is in within 'word'.
if (isGuessInWord == false)
{
totalLives--;
System.out.println("Sorry, but '" + guess + "' was not in the word.");
if (totalLives < 1)
{
System.out.println("It seems like you have no lives left! :(");
}
else if (totalLives == 1)
{
System.out.println("Careful! You only have 1 life left!");
}
else
{
System.out.println("You still have " + (totalLives) + " lives left!");
}
}
else
{
System.out.println("Nice one! The letter '" + guess + "' was in the word!");
for (position = 0; position < wordLength; position++)
{
for (position = 0; position < wordLength; position++)
{
if (word.charAt(position) == guess)
{
// Replacing every time '-' with guessed letter
displayWord = displayWord.substring(0,position) + guess + displayWord.substring(position + 1);
lettersRemaining--;
}
}
}
System.out.print(displayWord);
}
// Holds the user's previously guessed letters and the number of letters in the word that are still unknown.
System.out.println();
prevGuessedLetters = buffer.append(guess);
System.out.println("Previously guessed letters: " + (prevGuessedLetters));
System.out.println("Letters remaining: " + (lettersRemaining));
System.out.println("");
// Checks win/lose conditions.
if (lettersRemaining == 0)
{
System.out.println("Congratulations, '" + word + "' was the correct answer!");
}
if (totalLives < 1)
{
System.out.println("Sorry, you lose!");
System.out.println("The correct answer was '" + word + "'.");
{
break;
}
}
}
}
public static String getCategory()
{
String category;
System.out.println("=====================================");
System.out.println("Welcome to the Hangman Game!");
System.out.println("=====================================");
while (true)
{
System.out.println("Choose from the following categories:");
System.out.println("1. Car Brands");
System.out.println("2. Countries");
System.out.println("3. Animals");
System.out.println("4. Fruit");
System.out.println("");
category = strIn.nextLine();
if (category.toLowerCase().equals("1") || (category.toLowerCase().equals("one")))
{
category = "car brands";
}
else if (category.toLowerCase().equals("2") || (category.toLowerCase().equals("two")))
{
category = "countries";
}
else if (category.toLowerCase().equals("3") || (category.toLowerCase().equals("three")))
{
category = "animals";
}
else if (category.toLowerCase().equals("4") || (category.toLowerCase().equals("four")))
{
category = "fruit";
}
if (category.toLowerCase().equals("car brands") || category.toLowerCase().equals("countries") || category.toLowerCase().equals("animals") || category.toLowerCase().equals("fruit"))
{
System.out.println("");
System.out.println("Nice Choice! You have chosen the '" + category + "' category!");
System.out.println("");
break;
}
else
{
System.out.println("Sorry, but '" + category + "' is not a valid input. Try Again!");
System.out.println("");
}
}
return category;
}
public static String getWord(String category)
{
String[] carBrandsWord = {"toyota", "ferrari", "honda", "hyundai", "lamborghini", "dodge", "ford", "chevrolet", "fiat", "lexus", "volkswagen", "acura", "audi", "bentley", "bugatti", "buick", "cadillac"};
String[] countriesWord = {"canada", "england", "france", "switzerland", "australia", "sweden", "greece", "italy", "mexico", "brazil", "india", "china", "russia", "japan", "spain", "ireland"};
String[] animalsWord = {"cat", "dog", "parrot", "bear", "tiger", "monkey", "zebra", "hippopotamus", "chicken", "horse", "cow", "starfish", "squid", "wolf", "hyena", "cheetah", "penguin"};
String[] fruitsWord = {"apple", "banana", "orange", "grapes", "grapefruit", "apricot", "cherry", "guava", "kiwi", "mango", "melon", "olive", "pineapple", "strawberry", "watermelon"};
// String[] coloursWord = {"blue", "red", "orange", "purple", "pink", "yellow", "green"};
String word = "";
if (category.toLowerCase().equals("car brands"))
{
Random random = new Random();
int index = random.nextInt(carBrandsWord.length);
word = (carBrandsWord[index]);
}
else if (category.toLowerCase().equals("countries"))
{
Random random = new Random();
int index = random.nextInt(countriesWord.length);
word = (countriesWord[index]);
}
else if (category.toLowerCase().equals("animals"))
{
Random random = new Random();
int index = random.nextInt(animalsWord.length);
word = (animalsWord[index]);
}
else
{
Random random = new Random();
int index = random.nextInt(fruitsWord.length);
word = (fruitsWord[index]);
}
return word;
}
}
答案 0 :(得分：0)
您可以使用一套：
Set<Character> prevGuessedLetters = new HashSet<Character>();
...并添加猜测的字符：
prevGuessedLetters.add(guess);
...当你想测试之前是否猜到过一封信时：
boolean hasAlreadyBeenGuessed = prevGuessedLetters.contains(guess);