英文:
Adding Char to Char Array in Java
问题
我在Java方面还是比较新，所以请容忍。我正在制作一个简单的猜词游戏，接受用户的输入。我试图将猜测的字母添加到knownLetters数组中，但出现了类型不匹配的错误。我尝试过使用.concat()，但得到了相同的类型错误。以下是我目前的代码。有任何想法或者适合新手阅读的文档资源都会很有帮助。谢谢！
编辑：感谢大家的评论！这些都非常有帮助。
public static boolean updateWithGuess(char[] knownLetters,
char guessedLetter,
String word) {
System.out.println(Arrays.toString(knownLetters));
int i = 0;
while(word.indexOf(i, guessedLetter) != -1) {
i = word.indexOf(i, guessedLetter) + 1;
knownLetters += guessedLetter;
英文:
I'm still pretty new to Java so bear with me. I'm making a simple hangman game that takes input from the user. I am trying to append the guessed letter to the knownLetters array but I get a type mismatch. I tried .concat() and got the same type error. Here is where I am now. Any ideas or documentation resources (that a novice can read) would be helpful. Thanks!
Edit: Thanks for the comments, everyone! These are very helpful.
public static boolean updateWithGuess(char[] knownLetters,
char guessedLetter,
String word) {
System.out.println(Arrays.toString(knownLetters));
int i = 0;
while(word.indexOf(i, guessedLetter) != -1) {
i = word.indexOf(i, guessedLetter) + 1;
knownLetters += guessedLetter;
答案1
得分: 1
在这种情况下，使用数组并不是最佳选择，因为数组具有固定的大小，无法动态添加和删除项目，或许更好的选择是使用列表。
如果您需要简单的介绍，可以查看这里：
https://www.geeksforgeeks.org/list-interface-java-examples/
英文:
Using arrays in that case is not the best choice because arrays have a fixed size and you cannot dynamically add and remove items, maybe rather choose lists.
If you need a simple introduction, here you are:
https://www.geeksforgeeks.org/list-interface-java-examples/
答案2
得分: 0
其他人提到了 StringBuilder 和 List，这是朝着正确方向迈出的一步，因为它们是动态的（元素数量可变）。然而，由于这个问题仅关注于跟踪记录每个被猜测的字母，所以使用集合是最合适的。一个常见的示例是 HashSet。集合不允许重复项。但是集合将允许字符的大写和小写版本都存在于集合中（因为它们具有不同的值）。因此，您可以将所有猜测和已知字母规范化为大写或小写。
英文:
Others have mentioned StringBuilder and List which are a step in the right direction as they dynamic (in number of elements). However since this question is only concerned with keeping track of each letter that was guessed a set makes the most sense. One common example is HashSet. Sets do not allow duplicates. However sets will allow both the upper and lower case versions of a character to be present in the set (since they have different values). So you could normalize all the guesses and known letters to either uppercase or lowercase.
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