I am building a UI using Java FX scene builder and I want a button in a toolbar to float towards the right side of the toolbar. I have tried changing the node orientation of the parent(toolbar) and also the button but both seem to be ignored.
Add a pane with no content which always grows to fit available space between the left aligned tools in the bar and right aligned ones.

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<ToolBar prefHeight="40.0" prefWidth="318.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8">
<Button text="Apples" />
<Button text="Oranges" />
<Pane HBox.hgrow="ALWAYS" />
<Button text="Help" />
</ToolBar>
If you could place ur button inside a stack pane then u could make use of Stackpane's alignment property that takes javafx.geometry.Pos - The alignment of the child within the stackpane.For example in ur case:
<StackPane >
<Button translateY="-15" translateX="15" StackPane.alignment="TOP_RIGHT"/>
</StackPane>
来源:https://stackoverflow.com/questions/24896498/how-to-right-align-a-button-in-java-fx-toolbar