Looking to make a simple Facebook page scraper. Where would I start?

I want to make a simple Facebook page scraper (preferably using java) for my own personal use. Basically I would just specify the url of the Facebook page, start the program, and it would scrape likes and comments for me. I don't even want to remove duplicates. I don't really know anything about how scraping works. Are these types of things just made by analyzing the page source of the Facebook page (html code)? Can someone point me in the right direction to how to get started making this? I don't need to make any special GUI. Just a simple .jar that I will update and run every time I want to scrape a new page. Thank you!

EDIT: My initial thought was to see how the pagination changes as the page loads new posts, however it appears that the url remains the same.