//file: MoveButton.javaimport java.awt.*;import java.awt.event.*;import javax.swing.*;public class MoveButton extends JPanel {  JButton button = new JButton("I Move");  public MoveButton(  ) {    setLayout(null);    add(button);    button.setSize(button.getPreferredSize(  ));    button.setLocation(20, 20);    addMouseListener(new MouseAdapter(  ) {      public void mousePressed(MouseEvent e) {      button.setLocation(e.getX(), e.getY(  ));      }    });  }  public static void main(String[] args) {    JFrame f = new JFrame("MoveButton");    f.addWindowListener(new WindowAdapter(  ) {      public void windowClosing(WindowEvent e) { System.exit(0); }    });    f.setSize(250, 200);    f.setLocation(200, 200);    f.setContentPane(new MoveButton(  ));    f.setVisible(true);  }}