Excel Sheet Column Title(num168)

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example: 

    1 -> A
    2 -> B
    3 -> C
    ...
    26 -> Z
    27 -> AA
    28 -> AB

answer:

   
public class Solution {
    public  String convertToTitle(int n) {
		 
		  String title = "";
		 int k=0;
		 String node="";
		 
		 int num=1;
		 
		 Stack<String> stack = new Stack<String>();
		 
			 while(n>0)
			 {
				 
					 k=n%26;
					 if(k==0)k=26;
					 node = String.valueOf((char)(k+64));
					 stack.push(node);
					 n=(n-k)/26;					 
				 
			 }			 
		 		 
		 while(!stack.empty())
			 title += stack.pop();
		// System.out.println(title);
		 return title;
    }
}

注：java  string和ASIIC值互轉

String temp;

int i;

string--->assic

i=temp.hashcode();

assic--->string

temp=String.valueOf((char)i)