try (InputStream input = new FileInputStream("C:\\Users\\A\\Desktop\\java代码\\" + args[0])) {    String fileContent = new String(input.readAllBytes());    try (OutputStream output = new FileOutputStream("C:\\Users\\A\\Desktop\\java代码\\" + args[1])) {        output.write(fileContent.getBytes());    } catch (IOException e) {        System.out.println("error:文件写入失败");    }} catch (IOException e) {    System.out.println("error:文件读取失败");}