The top-level structure in a JavaFX application is the stage, which corresponds to a window. A stage can have one or more nodes, which are top level containers for scenes that make up the window contents.

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In JavaFX, the top-level structure is the Stage, which corresponds to a window. However, a Stage can have one or more Scenes, not nodes. Nodes are elements within a Scene.

The Top-Level Structure in a JavaFX Application Is the Stage