I am having a JDialog created when a menu item is selected
in a Frame (Simple Scenario). One parameter in the
constructor of the Dialog is a Class class parameter.
Within the dialog constructor, I know only that the Class
class parameter is a JComponent. So it can be a JButton,
JComboBox, JRadioButton.... etc. etc.
Now when I create the component inside the dialog's
constructor, how would I determine if it a JButton,
or JCombobox or JRadioButton.... etc... etc.. so that I can
attach the proper listner.
This is the general look of my JDialog....
public class myDialog extends JDialog implements
ActionListner, ItemListner (Other listners if required)
{
public myDialog(JFrame parent, Class cls)
{
//at this point I know that for sure (from outside)
//that when the call for the costructor comes, Class
//cls is going to be a JComponent
.........
//So then I create the JComponent like this...
JComponent component = cls.newInstance();
component.setVisible(true);
....
//Well when I run the program (full scale completion)
//I can see the component is created. I tested with a
//JButton, and a JRadioButton. But the question is
//I have to attach the proper listener. How would I
//know inside here (constructor of the dialog) whether
//it is a JButton or JRadio or JCheckbox.... etc..etc.
//to add the proper listener? Further if it is a
//component which requires a text string attached
//it like in a button or in a RadioButton, I cannot
//use the setText() unless if know for sure the
//setText method is in the subclass. I tried to
//downcast from JComponent. I am getting a
//ClassCastException.
}
}
Can anyone throw some light here?
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