Code to parse and pre-process the JSON file

Attribute

public class Attributes {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new FileReader(args[0]));
    String line = "";
    JsonParser jsonParser = new JsonParser();
    BufferedWriter output = 
    new BufferedWriter(new FileWriter(new File(args[1])));
    HashSet<String> ratings = new HashSet<String>();
    while((line = br.readLine()) != null){
      JsonElement json = jsonParser.parse(line);
      JsonObject review = json.getAsJsonObject();
      JsonObject newReview = new JsonObject();
      Set<Map.Entry<String, JsonElement>> entries = review.entrySet();
      for (Map.Entry<String, JsonElement> entry: entries) {
        if(entry.getKey().toString().equalsIgnoreCase("stars"))
        {
          ratings.add(entry.getValue().toString());
          newReview.add(entry.getKey().toString(), entry.getValue());
        }
        else if( entry.getKey().toString().equalsIgnoreCase("text"))
        {
          newReview.add(entry.getKey().toString(), entry.getValue());
        }
        output.write(newReview.toString()+"\n");
      }
    }
    output.write("Possible ratings are : ");
    for(String rating: ratings){
      output.write(rating + " " );
    }
    br.close();
    output.close();
  }
}