I have a file inside that file is ( 1:14 2:15 3:16 4:60 ) I want to write a class in Java that when I say 1 send me 14?

Question

I have a file inside that file is ( 1:14 2:15 3:16 4:60 ) I want to write a class in Java that when I say 1 send me 14 or say 2 send me 15 ?