java - 刽子手游戏不从文件中读取

Question

该程序应该从 .txt 文件中随机选择一个单词，并让用户尝试猜测该单词的字母。它运行了，但它总是说“在单词中找不到字母”，即使我知道这是所有单词都有的字母。这让我认为它没有正确读取我的 .txt 文件。

package hangman;

import java.io.File; 
import java.io.FileNotFoundException; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.Random; 
import java.util.Scanner; 
public class Hangman{



public static void main(String[] args) { 

     ArrayList<String> dictionaryList = new ArrayList<>(); 
     File file = new File("src/hangman.txt"); 
        try { 
         try (Scanner scanner = new Scanner(file)) {
             while (scanner.hasNextLine()) {
                 String line = scanner.nextLine();
                 dictionaryList.add(line);
             }
         } 
        } catch (FileNotFoundException e) { 
        } 

        /*  
         * Getting the word and hiding it 
         */ 

        Random rng = new Random(); 
        int word = rng.nextInt(dictionaryList.size()); //randomly chooses a word from the text file 
        Scanner scanner = new Scanner(System.in); 
        int guessesLeft = 6; // the total amount of guesses the user gets 
        ArrayList<Character> alreadyGuess = new ArrayList<>(); // keep tracks of the user's guesses 
        boolean wordFound = false; // keeps track of when the game will end after the user runs out of guesses 


        String wordSelected = dictionaryList.get(word); //converts the int value of the randomly choose word to a string 
        char[] letters = wordSelected.toCharArray(); // converts the word to a char 
        char[] hideWord = new char[letters.length]; // gets the length of hiding the word 


        // the for loop hides the word by replacing it with '_' 
        for(int i = 0; i < letters.length; i++) { 
           hideWord[i]='_'; 
        }  

        /*  
         * Starts the hangman game. The while loop will keep running the game. 
         */ 

        while(true){ 

            //for testing purposes they can use the print statement below to replace the other print statement 
            //System.out.print("\n" + wordSelected + "\n" + "Word: "); 
            System.out.print("\n" + "Word: "); 
            for(int i = 0; i < letters.length; i++){ 
                System.out.print(hideWord[i]); 
            } // Display the word 

            // Allows user to input and displays the guesses that are left 
            System.out.print("\n" + "Guesses Left: " + guessesLeft +"\nAlready Guess: " + alreadyGuess + "\nGuess: ");  
            char userInput = scanner.nextLine().toUpperCase().charAt(0); // uppercase the String first, and then pick the char 

            // Checks to see if the user already guess the same word 
            for(int i = 0; i < alreadyGuess.size(); i++){ 
                if(userInput==alreadyGuess.get(i)){ 
                    System.out.println("\nYou already guessed this letter. Try Again. ");  
                    break; 
                }  
            } 

            // records the user's guesses 
            if(!(alreadyGuess.contains(userInput))){ 
                alreadyGuess.add(userInput);  
            } 


            // Checks if the user guesses the right letter in the word 
            for(int i = 0; i < letters.length; i++) { 
                if(userInput==letters[i]) { 
                  hideWord[i] = userInput; 
                  wordFound = true; 

                } 
            } 


        // If user guesses the incorrect letter it will display this and lower the amount of guesses 
        if(!wordFound){ 
            System.out.println("\nThe letter was not found in the word. \n"); 
            guessesLeft = 1; 
        } 


        wordFound = false; // resets the wordFound boolean back to false 

        // if user runs out of guesses left, they will lose. 
        if(guessesLeft<=0){ 
            System.out.println("\nYou lose, you hanged the man."); 
            break; 
        } 

        // if user guesses correctly on the word, they win. Uses the array class to compare two char arrays 
        if(Arrays.equals(letters,hideWord)){ 
            System.out.println("\nWord: " + wordSelected); 
            System.out.println("\nCongratulations! You guess the right word and save the man from being hang."); 
            break; 
        } 


} 
  } 
} 

Answer 1

永远、永远、永远捕获并忽略异常!更改程序顶部的 catch 子句，如下所示:

catch (FileNotFoundException e) { 
    e.printStackTrace();
} 

这样，当您尝试阅读单词列表时，如果发生了不好的事情，您至少会得到提示。

这是一个非常重要的教训，值得以粗体重复:永远、永远、永远不要捕获和忽略异常!