Code for the Online Blackjack Game

We've covered different aspects of the Blackjack game and observed the attributes attached to the problem using various UML diagrams. Let us now explore the more practical side of things where we will work on implementing the Blackjack game 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 Blackjack game:

• Java

• C#

• Python

• C++

• JavaScript

Blackjack game classes#

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

Enumerations and custom data type#

The following code provides the definition of the enumeration and custom data type used in the Blackjack game.

Suit: We need to create an enumeration to keep track of the suit of the card, whether it is diamond, spade, heart, or club.

AccountStatus: We need to create an enumeration to keep track of the status of the account, whether it is active, canceled, closed, blocked, or none.

The Person class is used as a custom data type. The implementation of the Person class can be found below:

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.

Card #

This class contains the playing cards or cards used in the Blackjack game.

Deck and shoe #

Shoe is a device to hold multiple Deck and a Deck has 52 cards of four suits. One suit contains nine number cards (2–10) and four face cards (King, Queen, Jack, and Ace).

Hand#

The Hand class represents a Blackjack hand used in this game and contains multiple cards.

Players#

The Player is an abstract class and the BlackjackPlayer and Dealer classes extend the Player class.

• BlackjackPlayer: They place the first wager and update the stake with winning and losing sums. They can choose between the hit and stand options.

• Dealer: They are primarily in charge of dealing cards and following the Blackjack rules.

Blackjack controller and game view #

The BlackjackController class validates the actions (hit or stand) and responds accordingly. The BlackjackGameView class represents the game view.

Blackjack game #

The BlackjackGame class represents how we can play this game or its basic sequence of play.

Wrapping up#

We've explored the complete design of the Blackjack game in this chapter. We've looked at how a basic Blacljack game can be visualized using various UML diagrams and designed using object-oriented principles and design patterns.