“赋值的左侧必须是变量” charAt的问题 [英] "The left-hand side of an assignment must be a variable" problem with charAt

问题描述

private String kNow(String state, String guess) {
        for (int i = 0; i < word.length(); i++) {
            if (guess.equals(word.charAt(i))) {
                state.charAt(i) = word.charAt(i);
            }
        }
        return state;
    }

state.charAt（i）部分指出标题中的问题。
如果我的方法不完全错误，我该如何解决问题。

state.charAt(i) part points the problem in the title. How can I solve the problem, if my approach is not completely wrong.

推荐答案

工作是因为 charAt（int x）是 String 类的一个方法 - 即它是一个函数，不能在Java中为一个函数赋值。

The reason this doesn't work is because charAt(int x) is a method of the String class - namely it is a function, and you can't assign a function a value in Java.

如果你想循环一个字符串字符，我可能会这样做：

If you want to loop through a string character by character, I might be tempted to do this:

Char[] GuessAsChar = guess.toCharArray();

然后在GuessAsChar上操作。有些，根据你的需要，可能更好（如在更干净的）方法搜索字符等价在字符串。

Then operate on GuessAsChar instead. There are, depending on your needs, possibly better (as in neater) ways to approach searching for character equivalence in strings.

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