Properties and Bindings - JavaFX 8: A Definitive Guide to Building Desktop, Mobile, and Embedded Java Clients - page 180

In this example, the root is an ObjectProperty that observes Lighting objects. The binding colorBinding
observes the color property of the light property of the Lighting object that is the value of root . We then created
some Light and Lighting objects and changed their configuration in various ways.
When we run the program in Listing 4-15, the following output is printed to the console:

firstLight is black.
secondLight is white.
firstLighting has firstLight.
secondLighting has secondLight.
Making root observe firstLighting.
The color changed:
old color = 0xffffffff,
new color = 0x000000ff
Making root observe secondLighting.
The color changed:
old color = 0x000000ff,
new color = 0xffffffff
Changing secondLighting's light to firstLight
The color changed:
old color = 0xffffffff,
new color = 0x000000ff
Changing firstLight's color to red
The color changed:
old color = 0x000000ff,
new color = 0xff0000ff

As expected, a change event is fired for every change in the configuration of the object being observed by root ,
and the value of colorBinding always reflects the color of the light of the current Lighting object in root .

■ the JavaFX properties and bindings framework does not issue any warnings if the supplied property names
do not match any property names in a JavaFX bean. it will simply have the default value for the type: null for object type,
zero for numeric types, false for boolean type, and the empty string for string type.

Caution

Adapting JavaBeans Properties to JavaFX Properties
Over the many years since the JavaBeans specification was published, a lot of JavaBeans were written for various
projects, products, and libraries. To better help Java developers leverage these JavaBeans, a set of adapters were
provided in the javafx.beans.properties.adapter package to make them useful in the JavaFX world by creating a
JavaFX property out of JavaBeans properties.
In this section, we first briefly review the JavaBeans specification definition of properties, bound properties,
and constrained properties by way of a simple example. We then show you how to create JavaFX properties out of
JavaBeans properties using the adapters.

Understanding JavaBeans Properties
JavaBeans properties are defined using the familiar getter and setter naming convention. A property is “read only” if
only a getter is provided, and it is “read/write” if both a getter and a setter are provided. A JavaBeans event is made
up of the event object, the event listener interface, and listener registration methods on the JavaBean. Two particular