Professor Keenan, I confused the part 

"During the creation of a new person to add to the database, one thing you will need to ask for is the list of phone numbers.  The user should enter a phone number in the form "555-555-5555", a string with the parts of the number separated by a hyphen.  If the string entered does not follow the correct format, you should throw a"

The user should enter a phone number in the form "555-555-5555", so does that mean we should change the data field of the PhoneNumber class.

I tried to add additional information(GPA) of Student in the .csv format, I used the parseDouble(token[5]) , which it stores "3.25", but my program print out this exception. 

Exception in thread "main" java.lang.NumberFormatException: For input string: "3.25""
    at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
    at sun.misc.FloatingDecimal.parseDouble(Unknown Source)
    at java.lang.Double.parseDouble(Unknown Source)
    at hw06.DatabaseFileIO.readDatabaseFile(DatabaseFileIO.java:52)
    at hw06.Test.main(Test.java:58)