How to write a program in java that can convert a linked list (which its content taken from text file) to adjacency list depend on the ID of the course and prerequisite then making a directed graph.

This how the text file looks like which contains

ID,course name,prerequisite,hours

I stored each course content into a linked list but what can I do now ? How to represent it into a direct graph?

0817208, Intro. to statistics and Probability theory,0817111,3 0911210,0bject oriented Prog ,0911120,3 0911211, Data structure,0911120,3 0912212, Technical Reports,0912111,3 0913213,Digital Hardware,0913121,3 0914214, Com. & Network Fund,0911110,3 0817301,Discrete Math, 0817208,3 0911220,0bject oriented Prog (2),0911210,3