Java by API/javax.swing.plaf.basic/BasicComboBoxUI

extends BasicComboBoxUI

   <source lang="java">

import java.awt.BorderLayout; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.plaf.ruboBoxUI; import javax.swing.plaf.ruponentUI; import javax.swing.plaf.basic.BasicArrowButton; import javax.swing.plaf.basic.BasicComboBoxUI; public class MainClass {

 public static void main(final String args[]) {
   final String labels[] = { "A", "B", "C", "D", "E" };
   JFrame frame = new JFrame("Popup JComboBox");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JComboBox comboBox = new JComboBox(labels);
   comboBox.setUI((ComboBoxUI) MyComboBoxUI.createUI(comboBox));
   frame.add(comboBox, BorderLayout.NORTH);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }
 static class MyComboBoxUI extends BasicComboBoxUI {
   public static ComponentUI createUI(JComponent c) {
     return new MyComboBoxUI();
   }
   protected JButton createArrowButton() {
     JButton button = new BasicArrowButton(BasicArrowButton.EAST);
     return button;
   }
 }

}

      </source>