解密字符串

给一字符串如a2bc3d1 转换成aabcbcbcd

 1 　　String decode(String str) {
 2         String word="";
 3         StringBuilder result=new StringBuilder("");
 4         for(int i=0;i<str.length();i++)
 5         {
 6             String temp=str.charAt(i)+"";
 7             if(temp.matches("[a-z]"))
 8             {
 9                 result.append(temp);
10                 word+=temp;
11             }
12             else
13             {
14                 int times=Integer.parseInt(temp)-1;
15                 for(int j=0;j<times;j++)
16                     result.append(word);
17                 word="";
18             }
19         }
20         return result.toString();
21
22     }