[java]数字转换成字母串

这种转换相当于26进制的转换，数字27转换成字母串就是AA,如有需要，0也会用到。

package test
public class ConvertIntToAlpha 
{
	private int num;//27=AA 要转换的数字
	private int n;//冥次
	private int lastMax = 0;//上次最大冥次
	private StringBuilder stringBuilder = null;
	/**
	 * 主方法
	 * @param args
	 */
	public static void main(String[] args) 
	{
		ConvertIntToAlpha cita = new ConvertIntToAlpha();
		cita.num = 1379;
		String result = cita.getResult(cita.num);
		System.out.println("结果：" + result);
	}
	private String getResult(int num)
	{
		if(stringBuilder==null)
		{
			stringBuilder = new StringBuilder();
		}
		if(num==0) return new String("0");
		recursion(num);
		return stringBuilder.toString();
	}
	private void recursion(int num)
	{
		n=0;
		if(num<=0) return ;
		while(num<Math.pow(26, n) || num>=Math.pow(26, n+1))
		{
			n++;
		}
		for(int i=0;i<lastMax-n-1;i++)
		{
			//System.out.println("--补0--");
			stringBuilder.append("0");
		}
		lastMax = n;
		int current =(int)(num/(Math.pow(26, n)));
		//System.out.println("***"+current+"***");
		stringBuilder.append(intToChar(current));
		recursion(num-(int)(current*Math.pow(26, n)));
	}
	private char intToChar(int num)
	{
		return (char)('A'+num-1);
	}
}