Use Case Diagram for the Online Blackjack Game

Let's build the use case diagram of the Blackjack game and understand the relationship between its different components.

First, we’ll define the different elements of our Blackjack game, followed by the complete use case diagram of the system.

System

Our system is a "Blackjack game."

Actors

Now, we’ll define the main actors of our Blackjack game.

Primary actors

• Player: This actor is the main player of the game. This actor plays the game, which includes placing a bet, hit or stand, or quitting the game. This can also create, edit, or update its account.

Secondary actors

• Dealer: This is the secondary actor of the game, who manages the Blackjack table, dealing cards, and completing the payout of earnings. This actor can also manage the accounts and memberships of members.

Use cases

In this section, we will define the use cases for the Blackjack game. We have listed the use cases according to their respective interactions with a particular actor.

Note: You will see some use cases occurring multiple times because they are shared among different actors in the system.

Player

• Join a game: To join a new Blackjack game

• Place bet: To place a bet for the game

• View open games: To view open games that are waiting for the player to start

• Resigns a game: To leave a game in the middle of the game

• Hit: To request an extra card from the dealer

• Stand: To hold your cards and skip your turn

• Create account: To create a new account in the Blackjack game

• Update account: To update account information or password in the Blackjack game

• Reset password: To update the account password in the Blackjack game

• Cancel membership: To cancel membership in the Blackjack game

• Login/Logout: To log in and out of the Blackjack game

Dealer

• Create a new game: To start a new Blackjack game

• View open games: To view open games that are waiting for the player to start

• Create hands: To give two cards to the player and two cards to the dealer

• Draw card: To add cards from the deck to the player and dealer's hand

• Collect or payout: To give or take money after the game ends, depending upon the game's result

• Block member: To block any member to ensure they can't play the game

• Create account: To create a new account in the Blackjack game

• Update account: To update account information or password in the Blackjack game

• Reset password: To update the account password in the Blackjack game

• Cancel membership: To cancel membership in the Blackjack game

• Login/Logout: To log in and out of the Blackjack game

Relationships

This section describes the relationships between and among actors and their use cases.

Associations

The below table shows the association relationship between actors and their use cases.