如何获得一个字符替换字符串中的部分（JAVA） [英] How to get a char to replace parts in a string (java)
问题描述
我目前在做我介绍CS类阵列项目，我已经成功地做刽子手游戏。我想我开始它关闭相当正确的，但我似乎无法掌握如何更换一个字符为一个字符串。我必须要创建一个随机单词的方法，所以这就是为什么我在我的code的方法。检查出什么，我到目前为止有：
导入了java.util.Random;
进口java.util.Scanner中;
公共类ProjectNum2 {
//创建者的名字 公共静态无效的主要（字串[] args）{ 的System.out.println（欢迎来到刽子手文字游戏！）; 的String [] = wordKey {
循环，
对于，
而，
Java的，
开关，
扫描器，
其他，
双，
整数，
上市，
静态的，
方法，
返回，
空值，
作废，
真正，
假，
进口，
串，
字符
};
的String [] = wordSpace {
_ _ _ _
_ _ _，
_ _ _ _ _
_ _ _ _
_ _ _ _ _ _，
_ _ _ _ _ _ _，
_ _ _ _
_ _ _ _ _ _，
_ _ _ _ _ _ _，
_ _ _ _ _ _，
_ _ _ _ _ _，
_ _ _ _ _ _，
R _ _ _ _ _，
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _ _
_ _ _ _ _ _，
_ _ _ _ _ _，
_ _ _ _ _ _ _ _ _
};
的char [] =字母{'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'}; 最终诠释猜测= 6; INT索引= 0;
指数=（INT）randomGen（wordKey，wordSpace）; 扫描仪键盘=新的扫描仪（System.in）;
的System.out.println（）;
System.out.print（选择一个字母或输入零猜词：）;
字符字母= keyboard.nextLine（）的charAt（0）;
} 私有静态对象randomGen（字符串[] wordKey，字符串[] wordSpace）{
串gameWord;
随机randIndex =新的随机（）;
INT指数= randIndex.nextInt（wordKey.length）;
gameWord = wordSpace [指数]
System.out.print（gameWord）;
返回（指数）; }}
在Java中的字符串是不可变的，这意味着你不能改变它。你必须建立一个新的String对象，使用你的情况例如与string.replace（...）方法。
I am currently doing a array project in my intro CS class and I have to successfully make a game of hangman. I think I am starting it off fairly right, but I can't seem to grasp how to replace a char into a string. I have to have a method to create a random word, so that's why I have a method in my code. Check out what I have so far:
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);
}
}
Strings in Java are immutable, meaning that you cant change it. You have to build a new String object, using in your case for example the String.replace(...) method.
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