Code for the Online Stock Brokerage System
Write the object-oriented code to implement the design of the ‘online stock brokerage system’ problem.
We’ve reviewed different aspects of the online stock brokerage system and observed the attributes attached to the problem using various UML diagrams. Let’s explore the more practical side of things, where we will work on implementing the online stock brokerage system using multiple languages. This is usually the last step in an object-oriented design interview process.
We have chosen the following languages to write the skeleton code of the different classes present in the online stock brokerage system:
Java
C#
Python
C++
JavaScript
If you want to skip directly to the implementation and see the complete workflow, simply scroll down or click Executable Code: Online Stock Brokerage System.
Online stock brokerage system classes
This section will provide the skeleton code of the classes designed in the class diagram lesson.
Note: For simplicity, we are not defining getter and setter functions. The reader can assume that all class attributes are private, accessed through their respective public getter methods, and modified only through their public method functions.
Enumerations and custom data type
First, we will define all the enumerations required in the stock brokerage system. According to the class diagram, four enumerations are used in the system, i.e., OrderStatus, TimeEnforcementType, AccountStatus, and ErrorCode.The code to implement these enumerations and custom data types is as follows:
Note: JavaScript does not support enumerations, so we will use the
Object.freeze()method as an alternative that freezes an object and prevents further modifications.