In addition to the regular getters and setters, JavaFX provides a Property API to almost all its classes' fields.

For example, there are the following methods to work with the Stage title: 

String getTitle();              //getter
void setTitle(String title);    //setter 
StringProperty titleProperty(); //property access

Technically, getters and setters are not required, and the Property value can be used all the time. 

The Property class has the following two important APIs—Observable and Binding.