Java tutorial
import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JPopupMenu; public class Main { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setSize(400, 400); frame.setVisible(true); String[] list = { "1", "2", "3", "4", }; JComboBox<String> comb = new JComboBox<>(list); final JPopupMenu pop = new JPopupMenu(); pop.add(comb); frame.addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { System.out.println("mousePressed"); pop.show(e.getComponent(), e.getX(), e.getY()); } }); } }