public void setUserId(String userId) {
        this.userId = userId == null ? null : userId.trim();
    }
This method was generated by MyBatis Generator.
This method sets the value of the database column chat_group_user.user_id

@param userId the value for chat_group_user.user_id

@mbg.generated
AnyChatServer/src/main/java/org/anychat/model/base/ChatGroupUser.java