LeetCode - Excel Sheet Column Title

public class Solution {
    public String convertToTitle(int n) {
        
        StringBuilder ans = new StringBuilder();
        if(n < 1)
            ans.append("");
        else {
            while(n-- > 0) {
                char ch = (char) (n % 26 + ‘A‘);
                ans.append(ch);
                n /= 26;
            }
        }
        
        return ans.reverse().toString();
        
    }
}