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());
}
});
}
}
【jcombobox】
