JComboBox.isPopupVisible() has the following syntax.
public boolean isPopupVisible()
In the following code shows how to use JComboBox.isPopupVisible() method.
/*w w w . j a v a2 s.c o m*/ import javax.swing.JComboBox; public class Main { public static void main(String[] argv) throws Exception { String[] items = { "item1", "item2" }; JComboBox cb = new JComboBox(items); // Determine if the menu is visible boolean isVisible = cb.isPopupVisible(); } }