Объясните, пожалуйста

File your_file_name = File.createTempFile("your_file_name", null);

ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream(your_file_name));
ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(your_file_name));

ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream(your_file_name));

ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(your_file_name));