Hi,
A quick question about Swing:
A lot of the createUI() methods in the look and feel code are implemented with a
HashMap to retain references to the UI delegates that are created. For example:
public static ComponentUI createUI(JComponent component)
{
if (instances == null)
instances = new HashMap();
Object o = instances.get(component);
MetalComboBoxUI instance;
if (o == null)
{
instance = new MetalComboBoxUI();
instances.put(component, instance);
}
else
instance = (MetalComboBoxUI) o;
return instance;
}
I was wondering if anyone can explain the purpose of retaining the instance for each
component? (As opposed to just returning a new instance for each call). As I
understand it, the createUI() method will only be called once for each component
each time the look and feel is changed. So I don't see the need for retaining the
instances in the HashMap. Any pointers?
Regards,
Dave
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