JAVA有没有 可逆的算法？ 类？

public class BASE64Coding {
  private static BASE64Encoder encoder = new BASE64Encoder();
  private static BASE64Decoder decoder = new BASE64Decoder();

  public BASE64Coding() {
  }

  public static String encode (String s){
    return encoder.encode(s.getBytes());
  }

  public static String decode (String s){
    try {
      byte[] temp = decoder.decodeBuffer(s);
      return new String(temp);
    }
    catch (IOException ioe) {
        //handler  exception here
    }
    return null;
  }
}
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