import java.io.File;import javax.swing.ImageIcon;/* Utils.java is a 1.4 example used by FileChooserDemo2.java. */public class Utils {    public final static String jpeg = "jpeg";    public final static String jpg = "jpg";    public final static String gif = "gif";    public final static String tiff = "tiff";    public final static String tif = "tif";    public final static String png = "png";    /*     * Get the extension of a file.     */    public static String getExtension(File f) {        String ext = null;        String s = f.getName();        int i = s.lastIndexOf('.');        if (i > 0 &&  i < s.length() - 1) {            ext = s.substring(i+1).toLowerCase();        }        return ext;    }    /** Returns an ImageIcon, or null if the path was invalid. */    protected static ImageIcon createImageIcon(String path) {        java.net.URL imgURL = Utils.class.getResource(path);        if (imgURL != null) {            return new ImageIcon(imgURL);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }}