使用FileOutputStream在Java中写入文件

String remoteFile2 = "/test/song.mp3";
            File downloadFile2 = new File("D:/Downloads/song.mp3");
            OutputStream outputStream2 = new BufferedOutputStream(new FileOutputStream(downloadFile2));
            InputStream inputStream = ftpClient.retrieveFileStream(remoteFile2);
            byte[] bytesArray = new byte[4096];
            int bytesRead = -1;
            while ((bytesRead = inputStream.read(bytesArray)) != -1) {
                outputStream2.write(bytesArray, 0, bytesRead);
            }

这是一个用java编写代码的示例文件,

byte[] bytesArray = new byte[4096];

在这行中,4096的确切含义是什么,更改此值的可能性是什么?