package ex09_01;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFrame {  JPanel contentPane;  JButton jButton1 = new JButton();  /**Construct the frame*/  public Frame1() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    jButton1.setBorder(BorderFactory.createRaisedBevelBorder());    jButton1.setBorderPainted(false);    jButton1.setIcon(new ImageIcon(new java.net.URL("file:///C:/jbsample/Icon/dola.gif")));    jButton1.setSelectedIcon(new ImageIcon(new java.net.URL("file:///C:/jbsample/Icon/dola.gif")));    jButton1.setBounds(new Rectangle(52, 44, 53, 44));    jButton1.addMouseListener(new java.awt.event.MouseAdapter() {      public void mouseEntered(MouseEvent e) {        jButton1_mouseEntered(e);      }      public void mouseExited(MouseEvent e) {        jButton1_mouseExited(e);      }    });    contentPane.setLayout(null);    this.setSize(new Dimension(400, 300));    this.setTitle("Frame Title");    contentPane.add(jButton1, null);  }  /**Overridden so we can exit when window is closed*/  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  void jButton1_mouseEntered(MouseEvent e) {jButton1.setBorderPainted(true);  }  void jButton1_mouseExited(MouseEvent e) {jButton1.setBorderPainted(false);  }}