java - 字符错误 "char cannot be converted to string"

Question

我正在尝试使用以下代码，以便给定一个字符串，给出相同字符的最长连续子序列的长度。我收到错误“不兼容的类型:char 无法转换为 java.lang.String”。我在下面评论了发现错误的地方。

public class Test {
    public int longestRep(String str)
    {
        int currLen = 1;
        String currLet = "";
        String maxLet = "";
        int maxCount = 0;
        int currPos = 0;
        int strLen = str.length();
        for(currPos = 0; currPos < strLen; currPos++)
        {
            currLet = str.charAt(currPos); //error is on this line
            if(currLet = str.charAt(currPos+1))
            {
                currLen++;
            }
            else
            {
                if(currLen > maxLen)
                {
                    maxLen = currLen;
                    maxLet = currLet;
                    currLen = 1;
                }
            }
        }
    }
    public static void main(String args[])
    {
        longestRep("AaaaMmm");
    }
}

Answer 1

String.charAt(int) 返回一个字符。但是 currLet 是 String 类型，所以不能给字符赋值。使用 currLet = Character.toString(str.charAt(currPos)); 代替。