java - 如何获取一个字符来替换字符串中的部分(java)

Question

我目前正在 CS 入门课上做一个数组项目，我必须成功制作一款刽子手游戏。我认为我的开始相当正确，但我似乎无法掌握如何将字符替换为字符串。我必须有一个方法来创建一个随机单词，所以这就是为什么我的代码中有一个方法。看看我到目前为止有什么:

import java.util.Random;
import java.util.Scanner;
public class ProjectNum2 {
//creator's name

    public static void main(String[] args) {

        System.out.println("Welcome to the Hangman Word game!");

        String[] wordKey = {
                            "loop",
                            "for",
                            "while",
                            "java",
                            "switch",
                            "scanner",
                            "else",
                            "double",
                            "integer",
                            "public",
                            "static",
                            "method",
                            "return",
                            "null",
                            "void",
                            "true",
                            "false",
                            "import",
                            "string",
                            "character"
                           };
        String[] wordSpace = {
                              "_ _ _ _",
                              "_ _ _",
                              "_ _ _ _ _",
                              "_ _ _ _",
                              "_ _ _ _ _ _",
                              "_ _ _ _ _ _ _",
                              "_ _ _ _",
                              "_ _ _ _ _ _",
                              "_ _ _ _ _ _ _",
                              "_ _ _ _ _ _",
                              "_ _ _ _ _ _",
                              "_ _ _ _ _ _",
                              "r _ _ _ _ _",
                              "_ _ _ _",
                              "_ _ _ _",
                              "_ _ _ _",
                              "_ _ _ _ _",
                              "_ _ _ _ _ _",
                              "_ _ _ _ _ _",
                              "_ _ _ _ _ _ _ _ _"
                             };
        char[] letters = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};

        final int guesses = 6;

        int index = 0;
        index=(int) randomGen(wordKey, wordSpace);

        Scanner keyboard = new Scanner(System.in);
        System.out.println();
        System.out.print("Choose a letter or enter zero to guess the word: ");
        char letter = keyboard.nextLine().charAt(0);
    }

    private static Object randomGen(String[] wordKey, String[] wordSpace) {
        String gameWord;
        Random randIndex = new Random();
        int index = randIndex.nextInt(wordKey.length);
        gameWord = wordSpace[index];
        System.out.print(gameWord);
        return (index);

    }

}

Answer 1

Java 中的字符串是不可变的，这意味着您无法更改它。您必须构建一个新的 String 对象，在您的情况下使用 String.replace(...) 方法。