import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;

public class BindingDemo {

    public static void main(String[] args) {
        DoubleProperty d1 = new SimpleDoubleProperty(1.0);
        DoubleProperty d2 = new SimpleDoubleProperty(2.0);
        d1.bind(d2);
        System.out.println("d1 is " + d1.getValue()
                + " and d2 is " + d2.getValue());
        d2.setValue(70.2);
        System.out.println("d1 is " + d1.getValue()
                + " and d2 is " + d2.getValue());
    }
}