1. SceneBuilder中添加
SceneBuilder -> Miscellaneous -> Tooltip,将其拖到对应控件里便可。
2. 通过code添加
Tooltip tooltip = new Tooltip("This is tooltip");
tooltip.setStyle("-fx-font: normal bold 16 Langdon; "
+ "-fx-base: #AE3522; "
+ "-fx-text-fill: orange;");
addRangeBtn.setTooltip(tooltip);