import java.awt.*;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import javax.swing.*;
import sun.awt.SunToolkit;

public class JComboboxTestRTLTestDemo extends JFrame {
    JPanel jPanel = new JPanel();
    JPanel mainPanel = new JPanel();
    private javax.swing.JComboBox cBox;
    private Robot robot;
    SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
    public static void main(String[] args) throws Exception {
        JComboboxTestRTLTestDemo t = new JComboboxTestRTLTestDemo();
        t.createAndShowGUI();
        t.toolkit.realSync();
        t.test();
        System.exit(0);
       
    }
    private void createAndShowGUI() throws Exception {
        String[] cars = { "BMW" , "Lexus", "Honda", "Toyota", "Nissan" };
        cBox = new javax.swing.JComboBox(cars);
        //cBox.setEditable(rootPaneCheckingEnabled);
        cBox.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
        cBox.setMaximumRowCount(3);
        robot = new Robot();
        robot.setAutoDelay(50);
        cBox.setEnabled(true);
        mainPanel.setLayout(new BorderLayout());
        jPanel.add(cBox, BorderLayout.CENTER);
        mainPanel.add(jPanel, BorderLayout.CENTER);
        getContentPane().add(jPanel);
        setSize(300,150);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true);
    }
    private void test() {
        Point p = cBox.getLocationOnScreen();
        int height = cBox.getSize().height;
        int width = cBox.getSize().width;
        p.translate(width - 10,  height - 10);

        robot.mouseMove(new Double(p.getX()).intValue(),new Double(p.getY()).intValue());
        robot.mousePress(InputEvent.BUTTON1_MASK );
        robot.mouseRelease(InputEvent.BUTTON1_MASK );
        toolkit.realSync();

        robot.delay(5000);
    }
}