ActionListener and ItemListener

[Jenny]

Hi Friends,

First, for JRadioButton and JCheckBox, is ActionListener enough for
all the situations? I really cannot find a case where I must use
ItemListener instead of ActionListener interface.

Second, in the Class ItemEvent, what is the difference between the
getItemSelectable() and the getItem() methods.

Thanks a lot!

 

[Christian Kaufhold]

First, for JRadioButton and JCheckBox, is ActionListener enough for
all the situations? I really cannot find a case where I must use
ItemListener instead of ActionListener interface.

If you want to know whenever the selection changes, no matter whether
programmatically or by the user (provided ItemEvents remain implemented
in contradiction to the broken specification).

However, both specification and implementations of ItemSelectable or
so broken that I would not recommend to use them. Instead of Item-
Listener one can just use ChangeListener (except the AWT components)
to find out whenever the selection changes.

Second, in the Class ItemEvent, what is the difference between the
getItemSelectable() and the getItem() methods.

'itemSelectable' is the ItemSelectable, which may have one or more
items selected. The 'item' is that item which became (de-)selected.
For example, for JComboBox, the ItemSelectable is the combobox itself,
the item is the 'selectedItem' (or the object that was 'selectedItem'.


Christian