Java tutorial
import javafx.beans.binding.NumberBinding; import javafx.beans.property.IntegerProperty; import javafx.beans.property.SimpleIntegerProperty; public class Main { public static void main(String[] args) { final IntegerProperty width = new SimpleIntegerProperty(10); final IntegerProperty height = new SimpleIntegerProperty(10); NumberBinding area = width.multiply(height); System.out.println(width.get() + " " + height.get()); System.out.println(area.getValue()); width.set(100); height.set(200); System.out.println(width.get() + " " + height.get()); System.out.println(area.getValue()); } }