Name: dgC58589 Date: 01/22/98


I subclassed JTabbedPane and overloaded the setSelectedIndex method as follow:

public void setSelectedIndex(int theIndex)
{
    Component c = getSelectedComponent();
    ...
}

When the JTabbedPane is first created it calls the setSelectedIndex method. At this point there is not currently selected component. I would expect getSelectedComponent to return null but instead it throws an exception. The source code for JTabbedPane.getSelectedComponent is:

return getComponentAt(getSelectedIndex());

Since getSelectedIndex returns -1 at this point it is getComponentAt that throws the exception.

I would rewrite getSelectedComponent as:

Component c = null;
int i = getSelectedIndex();
if (i != -1)
    c = getComponentAt(i);
return c;
(Review ID: 23769)
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