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Explain JavaFX Scene Graph
In JavaFX, the GUI Applications were constructed using a Scene Graph. A scene graph is a data structure similar to tree, in modern graphical applications. It is the starting point of the application, and it is a collection of nodes
To display something in JavaFX You need to construct a scene graph using the nodes and set it to an object of the Stage class, the top level container of a JavaFX application.
A node is a visual/graphical primitive object of a JavaFX application.
- Each node in the scene graph has a single parent, and the node which does not contain any parents is known as the root node. 
- In the same way, every node has one or more children, and the node without children is termed as leaf node; a node with children is termed as a branch node. 
- A node instance can be added to a scene graph only once. The nodes of a scene graph can have Effects, Opacity, Transforms, Event Handlers, Event Handlers, Application Specific States. 

In a JavaFX application the javafx.scene.Scene class holds all the contents of a scene graph. While creating a scene it is mandatory to specify the root node.
