When u add the entries on run times normally that data is not for presistant
like it is placed in ram there it can't be stored permannet and it'll be vanish
as ur program  exit and for that it is more appropriate to use databases at the
back end. it is not difficult there r just like 7 or 8 commands and u'll able to
store data. and you have to use java.sql package for that take a look at its
help it will me very usefull to you.