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 | import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
 
/**
 *
 * @author 
 */
public class Test extends Application {
 
    public static void main(String[] args) {
        launch(args);
    }
 
    @Override
    public void start(Stage stage) throws Exception {
 
        Circle c = new Circle();
        Group root = new Group(c);
        Scene scene = new Scene(root, 100, 100);
        c.centerXProperty().bind(scene.widthProperty().divide(2));
        c.centerYProperty().bind(scene.heightProperty().divide(2));
        c.radiusProperty().bind(Bindings.min(scene.widthProperty(),
                scene.heightProperty())
                .divide(2));
        c.radiusProperty().addListener((obs, old, nw) -> {
            System.out.println(" oldRadius = "+old + ", newRadius = "+nw );
        });
        stage.setTitle("Binding in JavaFX");
        stage.setScene(scene);
        stage.sizeToScene();
        stage.show();
 
    }
 
} | 
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