// 13-1package HelloWorldSwing;import javax.swing.*;import javax.swing.ImageIcon;public class HelloWorldSwing {    public static void main(String[] args) {        JFrame frame=new JFrame("helloworld");        final JLabel label=new JLabel("hello world");        frame.getContentPane().add(label);        frame.setSize(200,80);        frame.addWindowListener(new WindowAdapter(){          public void WindowClosing(WindowEvent e){            System.exit(0);          }        });        frame.setVisible(true);        frame.setIconImage(new ImageIcon("javaIcon.gif").getImage());  }}