Properties and Bindings - JavaFX 8: A Definitive Guide to Building Desktop, Mobile, and Embedded Java Clients - page 146

System.out.println("Unbinding otherProperty from intProperty.");
otherProperty.unbind();
System.out.println("otherProperty.get() = " + otherProperty.get());
System.out.println("Calling intProperty.set(8192).");
intProperty.set(8192);
System.out.println("otherProperty.get() = " + otherProperty.get());
}
}
In this example we created a SimpleIntegerProperty object called intProperty with an initial value
of 1024 . We then updated its value through a series of different integers while we added and then removed
an InvalidationListener , added and then removed a ChangeListener , and finally created another
SimpleIntegerProperty named otherProperty , bound it to and then unbound it from intProperty . We have taken
advantage of the Java 8 Lambda syntax in defining our listeners. The sample program used a generous amount of
println calls to show what is happening inside the program.
When we run the program in Listing 4-1, the following output is printed to the console:
intProperty = IntegerProperty [value: 1024]
intProperty.get() = 1024
intProperty.getValue() = 1024
Added invalidation listener.
Calling intProperty.set(2048).
The observable has been invalidated: IntegerProperty [value: 2048].
Calling intProperty.setValue(3072).
The observable has been invalidated: IntegerProperty [value: 3072].
Removed invalidation listener.
Calling intProperty.set(4096).
Added change listener.
Calling intProperty.set(5120).
The observableValue has changed: oldValue = 4096, newValue = 5120
Removed change listener.
Calling intProperty.set(6144).
otherProperty.get() = 0
Binding otherProperty to intProperty.
otherProperty.get() = 6144
Calling intProperty.set(7168).
otherProperty.get() = 7168
Unbinding otherProperty from intProperty.
otherProperty.get() = 7168
Calling intProperty.set(8192).
otherProperty.get() = 7168
By correlating the output lines with the program source code (or by stepping through the code in the debugger of
your favorite IDE), we can draw the following conclusions.