如何在一个文件中写入多个LinkList并将LinkedList读入LinkedList的ArrayList中？

Question

I am doing a project in Processing which is based on Java. My project is on Visualizing the retweets for tweets on a give topics (# tags). I am using twitter4j to interact with Twitter API. I always end up exceeding the Twitter API Rate limit (15 queries an hour) which limits my visualization data set.

Now I am trying to write a script which runs overnight with some periodic interval to collect the data from twitter. In this way I think I will not cross the rate limit of Twitter API.

Something like this .

My project goes on twitter to search for tweets according to query parameters and for every tweets it finds it collects its retweets and then extract the user location of the tweet and retweet, pass it to Google Maps Geocoding API and gets the latitude and longitude of the tweet's user location and location of all the retweets for this tweet. Basically, the first node of the linked list stores the latitude and longitude of the tweet and following nodes stores the same of retweets.

Tweet -> Retweet 1 -> Retweet2
[22.4655, 34.5678]->[23.2344, 23.4545]->.....

and I have n number of linked list of this kind which I store in an ArrayList . In short I have an ArrayList of LinkedList and the LinkedList 's node is a PVector containing latitude and longitude of a location.

Now to handle the rate limit I want to write a script which does the same thing but writes the data to file which my visualization program can read and visualize on WorldMap. For this I want to prepare a LinkedList for a tweet with all its retweet's location and then write that linked list to a file then the same for the second tweet in the second line of the file.

In my visualization program I want to read the data line by line in linkedlists and store them collectively in an arraylist. I want keep this kind of structure because my visualization program is based on this.

I think this is more than sufficient information on what I am trying to do but with my limited exposure to Processing and Java I am confused about how to do it.

To summarize I want to write multiple linkedlist on a file so that one line contains one linked list and then read them line by line in n number of linkedlist and store them collectively in an arraylist.

Answer 1

You can do a simple trick to build a set of Strings to write on a file. That is too much straight forward but the solution you are expecting. (As you want to read a file line-by-line)
But it will be a too much messy code to read lines and split them. If you try Serialization (as @pm-77-1 said), you don't have to bother about those stuff. You can store the whole block at once, read the whole block at once.
1st, write a code to serialize your ArrayList using the input file you already have. Then write a code to de-serialize it and replace your file-reading segment with that.