code: public void modifyInstancePassword(String instanceId, String adminPass) throws BceClientException {
          this.modifyInstancePassword(new ModifyInstancePasswordRequest()
                  .withInstanceId(instanceId).withAdminPass(adminPass));
      }
docs: Modifying the password of the instance.
  
  You can change the instance password only when the instance is Running or Stopped ,
  otherwise,it's will get <code>409</code> errorCode.
  
  This is an asynchronous interface,
  you can get the latest status by invoke {@link #getInstance(GetInstanceRequest)}
  
  @param instanceId The id of the instance.
  @param adminPass The new password to update.
  The adminPass will be encrypted in AES-128 algorithm
  with the substring of the former 16 characters of user SecretKey.
  @throws BceClientException