【求助】编的JAVA连连看小程序，测试图片不全怎么弄啊

private static Icon icons[] = new ImageIcon[6 * 5];
private static final String imgDir = "F:\\Java\\游戏\\LLK\\图片";
static {
    try {
        File dir = new File(imgDir);
        File[] imgFiles = dir.listFiles(new FilenameFilter() {
                    public boolean accept(File dir, String name) {
                        return name.toLowerCase().endsWith(".jpg");
                    }
                });
        for (int i = 0; i <15; i++) {
            icons[i] = new ImageIcon(imgFiles[i].getAbsolutePath());
            //System.out.println(i+"  "+icons[i]);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}