Some help with java problem

im writing a program that parses data from a log file. each line in the log is either a process wit a start time or an end time for one of the started processes. i already figured out how to print all the start times but i cant wrap my head around how to pull out the end time for each of the started processes. i want to put all the end times in a hashmap and iterate thru to find the end times for each process. the end times are usually within an hour of the start time. thanks in advance