package ex09_04;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFrame {  JPanel contentPane;  BorderLayout borderLayout1 = new BorderLayout();  JButton jButton1 = new JButton();  JButton jButton2 = new JButton();  JButton jButton3 = new JButton();  JButton jButton5 = new JButton();  JButton jButton4 = 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.setText("北/North");    contentPane.setLayout(borderLayout1);    this.setSize(new Dimension(400, 300));    this.setTitle("Frame Title");    jButton2.setText("西/West");    jButton3.setText("中/Center");    jButton5.setText("東/East");    jButton4.setText("南/South");    contentPane.add(jButton1, BorderLayout.NORTH);    contentPane.add(jButton2, BorderLayout.WEST);    contentPane.add(jButton3, BorderLayout.CENTER);    contentPane.add(jButton5, BorderLayout.EAST);    contentPane.add(jButton4, BorderLayout.SOUTH);  }  /**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);    }  }}