Java Reference
In-Depth Information
Ask the Expert
Q
:
You have explained how to add a node to the scene graph. Is there a way to re-
move one?
A
:
Yes, to remove a control from the scene graph, call
remove( )
on the
Observ-
ableList
. For example,
removes
myLabel
from the scene. In general,
ObservableList
supports a wide range of
list-management methods. Here are two examples. You can determine if the list is empty
by calling
isEmpty( )
. You can obtain the number of nodes in the list by calling
size( )
.
You will want to explore
ObservableList
on your own as you advance in your study of
JavaFX.
This program produces the following window:
In the program, pay special attention to this line:
It adds the label to the list of children for which
rootNode
is the parent. Although this line
could be separated into its individual pieces if necessary, you will often see it as shown
here.
