okay, i know how to read and write files in java, but im not really sure how i would apply them effectively. or is there a database type thing that i could use like mysql for java.. like for example, i made a program that is a bank and it creates bank account with balances, names, etc. now when i close this program i want to be able to save those accounts so that the next time i run the program, it will load up those accounts and i can continue to add more accounts.