responsive design JavaFX

gistfile1.java

Toolbar extraSmallToolbar = new Toolbar(...);
extraSmallToolbar.getStyleClass().add("visible-xs");

Toolbar smallToolbar = new Toolbar(...);
smallToolbar.getStyleClass().add("visible-sm");

Toolbar mediumToolbar = new Toolbar(...);
mediumToolbar.getStyleClass().add("visible-md");

Toolbar largeToolbar = new Toolbar(...);
largeToolbar.getStyleClass().add("visible-lg");

pane.getChildren().add(extraSmallToolbar, smallToolbar, mediumToolbar, largeToolbar);