Report Employee Time Clock Cannot Find Corresponding Dates In And Out

I have this assignment to build an employee time clock. By using a menu you can enter an employee, enter punch in and out, and report.When I created the punch screen I wrote the in and out records to a file. Because there can be several employees punching in or out the file wrote each occurrence on different lines. Now I am attempting to write the report which you enter an employee Id and loop through the file to find the in and out date and then calculate the time (hours worked). I loaded the file into an Arraylist but now I cannot figure out how to loop through find the In and Out date - calculate the hours worked and then move on to the next day. here is the format of the file - employee id, place holder I or O, date, time, day. and sample

111221111i3/2/145:10 PMSunday
111221111o3/2/145:10 PMSunday
111331111i3/2/145:25 PMSunday
111331111o3/3/1412:47 PMMonday
111221111i3/3/1412:48 PMMonday
111221111o3/3/142:23 PMMonday
111441111i3/4/141:30 PMTuesday

[code]....

here is my code from the main screen.

public static void displayPunches()
throws FileNotFoundException, IOException, ParseException {
boolean isValid = false;
String choice = "y";
String emp = Validator.getLine(sc, "Enter I -Individual or A -All ");
if (emp.equalsIgnoreCase("A"))

[code]....