ดูว่า Click Mouse ที่ตำแหน่งไหน

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class MainClass extends JPanel {
  public MainClass() {
      addMouseListener(new MouseAdapter() {
          public void mousePressed(MouseEvent me) {
            System.out.println(me.getXOnScreen()+","+me.getYOnScreen());
          }
        });
  }
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.getContentPane().add(new MainClass());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}