void mouseClicked(MouseEvent e) { if (e.isAltDown()) { // do something when Alt key is down } }
void mouseDragged(MouseEvent e) { if (e.isAltDown()) { // do something when Alt key is down during dragging } }In this example, we check whether the Alt key is down while the mouse is being dragged. If it is down, we can perform some action. The package library for MouseEvent is javafx.scene.input.