java关于编码和解码问题

1.  public static void main(String[] args)throws Exception {
1.         String a = "%E4%BD%86%E4%B8%8D%E6%98%AF%E4%B8%8D%E6%87%82%E4%BA%8B%23%C2%A5%23%25%C2%A5%40";
1.         String b = "%E4%BD%86%E4%B8%8D%E6%98%AF%E4%B8%8D%E6%87%82%E4%BA%8B#%C2%A5#%25%C2%A5@";
1. 
1. 
1.         System.out.println(URLDecoder.decode(a,"utf-8"));
1.         System.out.println(URLDecoder.decode(b,"utf-8"));
1. 
1.         String encode = URLEncoder.encode("但不是不懂事#¥#%¥@","utf-8");
1. 
1.         System.out.println(encode);
1. 
1.     }
1. 
```输出：
但不是不懂事#¥#%¥@
但不是不懂事#¥#%¥@
%E4%BD%86%E4%B8%8D%E6%98%AF%E4%B8%8D%E6%87%82%E4%BA%8B%23%C2%A5%23%25%C2%A5%40

如何编码后能得到b；

b不是标准的URLCODE编码