Properties and Bindings - JavaFX 8: A Definitive Guide to Building Desktop, Mobile, and Embedded Java Clients - page 174

The program in Listing 4-10 defines a view class that watches over an instance of the JavaFX Bean defined in
Listing 4-9. It observes changes to the i , str , and color properties of the bean by hooking up change listeners that
print out any changes to the console.
Listing 4-10. JavaFXBeanViewExample.java
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.paint.Color;
public class JavaFXBeanViewExample {
private JavaFXBeanModelExample model;
public JavaFXBeanViewExample(JavaFXBeanModelExample model) {
this.model = model;
hookupChangeListeners();
}
private void hookupChangeListeners() {
model.iProperty().addListener(new ChangeListener<Number>() {
@Override
public void changed(ObservableValue<? extends Number> observableValue, Number 
oldValue, Number newValue) {
System.out.println("Property i changed: old value = " + oldValue + ", new 
value = " + newValue);
}
});
model.strProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> observableValue, String 
oldValue, String newValue) {
System.out.println("Property str changed: old value = " + oldValue + ", new 
value = " + newValue);
}
});
model.colorProperty().addListener(new ChangeListener<Color>() {
@Override
public void changed(ObservableValue<? extends Color> observableValue, Color 
oldValue, Color newValue) {
System.out.println("Property color changed: old value = " + oldValue + ", 
new value = " + newValue);
}
});
}
}
The program in Listing 4-11 defines a controller that can modify a model object.