Read pdf with specific header in Java?

Question

How to get a specific header or paragraph title of a pdf file by Java?
For example:
Title1
Subtitle 1
Subtitle 2

Title2
Subtitle 1
Subtitle 2

I want to find all subtitles 2 in all pages.

Answer 1

you want to read a pdf file with java?

Answer 2

yes

Answer 3

you can use Tika library to read almost any type of file including PDF