Implement Stack To Provide Input In File

I have a file containing a line that starts with professors name followed by the subject name and the semester when it will be taken.I have to Implement Stack to provide input in the file , read the file and then it will ask for a user input of Professor Name and the Semester. The program will determine the subjects taken by the professor and if there is Classes of the same professor in the user provided Semester.

I only know how to read line by line in a text file and not a single string in a file that then will determine the subject taken by that professor and that semester.

here is the text file

Harry Williams | Advanced DBMS | 4

James H. | Computer Networks | 3

Sasha Ben | Artificial Intelligence | 2

Harry Williams | Software Engineering | 3

Palbo Kastro | Formal Languages | 1

Alex W | Advanced SE | 1

James H | Operating System | 3

here is the code I have so far

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class Schedule{

public static void main(String[] args) {
try {
File file = new File("Professor.txt");
FileReader fileReader = new FileReader(file);

[code]....