public boolean write() {
        boolean flag = true;
        try {
            File file = new File("D:\\workspace\\JavaWorks\\BooksManger\\src\\com\\company\\BookNameList.txt");
            if (!file.exists())
                System.out.println("书单创建成功！ " + (file.createNewFile()) + "\t" + "书单名为： " + file.getName());
//            FileInputStream  fis = new FileInputStream(BookNameList.toString());
            FileOutputStream fos = new FileOutputStream("D:\\workspace\\JavaWorks\\BooksManger\\src\\com\\company\\BookNameList.txt");
//            getByte()方法是将字符串转换成Byte形式
            fos.write(BookNameList.toString().getBytes());
//            while(true) {
//                byte[] b = new byte[100];
//                int temp = fis.read(b,0,b.length);
//                if(temp == -1)
//                    break;
//                fos.write(b,0,temp);
//                fis.close();
//                fos.close();
//            }
            System.out.println("书单名为： " + file.getName() + "\n" + "在 " + file.getAbsolutePath());
        } catch (Exception e) {
            e.printStackTrace();
        }
//        打印输出简单的树状结构
        File file = new File("D:\\workspace\\JavaWorks\\BooksManger\\src");
        this.printList(file);
        return true;
    }

图片示例：