MouseAdapter

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class MouseDetailsFrame extends JFrame
{
    private JLabel lStatus;
    private String details;

    public MouseDetailsFrame()
    {
        super("Testando adaptadores");

        lStatus=new JLabel("Click com o mouse");
        add(lStatus,BorderLayout.SOUTH);
        addMouseListener(new MouseClickHandler());
    }
    private class MouseClickHandler extends MouseAdapter
    {
        public void mouseClicked(MouseEvent e)
        {
            int xPos=e.getX();
            int yPos=e.getY();

            details=String.format("Clicou %d vez(es)",e.getClickCount());

            if(e.isMetaDown())
                details+=" Com o botão direito";
            else if(e.isAltDown())
                details+=" Com o botão do centro";
            else
                details+=" Com o botão esquerdo";

            lStatus.setText(details);
        }
    }
    public static void main(String args[])
    {
        MouseDetailsFrame f=new MouseDetailsFrame();
        f.setVisible(true);
        f.setSize(520,400);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}