Java MouseEvent.paramString()

public String paramString()

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
/*from ww w  .  j a v a  2  s .  c  o  m*/
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JPanel {
  JButton button = new JButton("click frame not me");

  public Main() {
    setLayout(null);
    add(button);
    button.setSize(button.getPreferredSize());
    button.setLocation(20, 20);
    addMouseListener(new MouseAdapter() {
      public void mousePressed(MouseEvent event) {
        System.out.println(event.paramString());
      }
    });
  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("MoveButton");
    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    frame.setSize(250, 200);
    frame.setLocation(200, 200);
    frame.setContentPane(new Main());
    frame.setVisible(true);
  }
}