public class BasicComboBoxUI.FocusHandler extends Object implements FocusListener
BasicComboBoxUI类中BasicComboBoxUI 。 
      | Constructor and Description | 
|---|
| FocusHandler() | 
public void focusGained(FocusEvent e)
FocusListener 
          focusGained在界面 
            FocusListener 
           public void focusLost(FocusEvent e)
FocusListener 
          focusLost在界面 
            FocusListener 
            Submit a bug or feature 
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