code: public void updateComputeNodeUser(String poolId, String nodeId, String userName, String password, DateTime expiryTime, Iterable<BatchClientBehavior> additionalBehaviors) throws BatchErrorException, IOException {
          NodeUpdateUserParameter param = new NodeUpdateUserParameter();
          param.withPassword(password);
          param.withExpiryTime(expiryTime);
  
          updateComputeNodeUser(poolId, nodeId, userName, param, additionalBehaviors);
      }
docs: Updates the specified user account on the specified compute node.
  
  @param poolId The ID of the pool that contains the compute node.
  @param nodeId The ID of the compute node where the user account will be updated.
  @param userName The name of the user account to update.
  @param password The password of the account. If null, the password is removed.
  @param expiryTime The time at which the account should expire. If null, the expiry time is replaced with its default value.
  @param additionalBehaviors A collection of {@link BatchClientBehavior} instances that are applied to the Batch service request.
  @throws BatchErrorException Exception thrown when an error response is received from the Batch service.
  @throws IOException Exception thrown when there is an error in serialization/deserialization of data sent to/received from the Batch service.