ComboBoxFrame.java 文件源码

public ComboBoxFrame()
{
   super("Testing JComboBox");
   setLayout(new FlowLayout()); // set frame layout     

   imagesJComboBox = new JComboBox<String>(names); // set up JComboBox
   imagesJComboBox.setMaximumRowCount(3); // display three rows

   add(imagesJComboBox); // add combobox to JFrame
   label = new JLabel(icons[0]); // display first icon
   add(label); // add label to JFrame
   imagesJComboBox.addItemListener(event -> { 
        if (event.getStateChange() == ItemEvent.SELECTED)
           label.setIcon(icons[imagesJComboBox.getSelectedIndex()]);
        }); // end call to addItemListener
}