Chapter 13.5, Problem 13.24CP

Explanation of Solution

Object for keeps the list of items in “ComboBox” control:

• The list of items in the “ComboBox” control keeps its list of items in an "ObservableList" object.
• In the “ComboBox” class, the method named “getItems()” returns the “ObservableList” that holds the ComboBox’s items.
• Various containers in the JavaFX library implement the “ObservableList” interface.
  • It is useful to learn a few of the methods specified in the interface.
  • The user can change the properties of list in interface.
• Some of the “ObservableList” methods are given below
  • add(item) – it is used to add a single item to the list...