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class SensorData implements Serializable {
  // 1MB of data per instance!
  ... 
  public static SensorData readSensorData() {...}
  public static boolean availableisAvailable() {...}
}

class SerializeSensorData {
  public static void main(String[] args) throws IOException {
    ObjectOutputStream out = null;
    try {
      out = new ObjectOutputStream(
          new BufferedOutputStream(new FileOutputStream("ser.dat")));
      while (SensorData.availableisAvailable()) {
        // note that each SensorData object is 1MB in size
        SensorData sd = SensorData.readSensorData();
        out.writeObject(sd);
      }
    } finally {
      out.close();
    }
  }
}

class SerializeSensorData {
  public static void main(String[] args) throws IOException {
    ObjectOutputStream out = null;
    try {
      out = new ObjectOutputStream(
          new BufferedOutputStream(new FileOutputStream("ser.dat")));
      while (SensorData.availableisAvailable()) {
        // note that each SensorData object is 1MB in size
        SensorData sd = SensorData.readSensorData();
        out.writeObject(sd);
        out.reset(); // reset the stream
      }
    } finally {
      out.close();
    }
  }
}