题目描述

力扣

class Solution {
    public String convertToTitle(int columnNumber) {
        //26进制！参考十进制转十六进制0~25代表A~Z
        StringBuilder sb=new StringBuilder();
        while(columnNumber>0){
            //余数转成字符
           int temp=(columnNumber-1)%26;
           char tempChar=(char)(temp+65);
           //除以26
           columnNumber=(columnNumber-1)/26;
           //从下往上写，所以要反转
           sb.append(tempChar);
        }
        return sb.reverse().toString();
    }
}

运行截图