JavaFX Fundamentals - Java 8 Recipes - page 596

ChoiceBox sizeChooser = new
ChoiceBox(FXCollections.observableArrayList(
"1", "2", "3", "4", "5")

);
// Select the first option by default
sizeChooser.getSelectionModel().selectFirst();

sizeChooser.getSelectionModel().selectedIndexProperty().addListener(
(ChangeListener)(ov, old, newval) -> {
Number idx = (Number)newval;

switch(idx.intValue()){
case 0:
graphicsContext.setLineWidth(1);

break;

case 1:
graphicsContext.setLineWidth(2);

break;

case 2:
graphicsContext.setLineWidth(3);

break;

case 3:
graphicsContext.setLineWidth(4);

break;

case 4:
graphicsContext.setLineWidth(5);

break;

default:
graphicsContext.setLineWidth(1);

break;

}

});
sizeChooser.setTranslateX(5);

canvas.addEventHandler(MouseEvent.MOUSE_PRESSED,
(MouseEvent event) -> {
graphicsContext.beginPath();