Code for the Online Stock Brokerage System

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

Online stock brokerage system classes

In this section, we’ll 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 and accessed through their respective public getter methods and modified only through their public method functions.

Enumerations and custom data type

First of all, we will define all the enumerations required in the stock brokerage system. According to the class diagram, there are three enumerations used in the system i.e. OrderStatus, TimeEnforcementType and AccountStatus. The code to implement these enumerations and custom data types is as follows:

Note: JavaScript does not support enumerations, so we will be using the Object.freeze() method as an alternative that freezes an object and prevents further modifications.

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