Codename One Tutorial Shows How to Build a Blackjack Card Game Using Game Builder

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A new tutorial from the DEV Community walks developers through building a blackjack card game called Duke Jack using the Codename One open-source framework. The guide uses Game Builder's board mode, which arranges game elements on a flat grid of cells rather than a scrolling world, making it a natural fit for a card table layout. Developers place card actors on a Pieces layer with rank, suit, and faceUp properties, while a separate tile layer handles the static felt surface. The tutorial covers core blackjack mechanics including hit, stand, the dealer's hole card, and win/lose logic, all driven by a companion class that reads card data and applies game rules. Card visuals are drawn manually using Codename One's standard Graphics API, with no built-in card-rendering engine involved.

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