How to change the Boolean flag rectangle into 2 triangles.

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  I want to create several Rectangles (or in which object or object) in which I want to store data. I want to spend the Rectangles (objects) that appear in front of the user by using the buttons. The example that I put in place does not work correctly. Can you tell me what is the right way to implement this?

  REF javafx 2 - How to change the Rectangles with buttons - stack overflow

  You have two problems:

  User data that assign you to each button switches are a node, not a [Node]. Thus, the cast will fail on line 43.

  When the selected toggle changes, you add another Rectangle to the vbox. You want to replace the rectangle that is in the vbox.

  Try

  vbox.getChildren () .setAll ((Node) group.getSelectedToggle () .getUserData ());

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