How Do I Save Data in a Java Windows App? -

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i'm creating simple windows app using java allows users save passwords , usernames websites of choice. how make when user logs off app, information user posted in app saved? of data being saved arrays , linked lists, if helps.

edit: know i/o , saving data files. i'm looking solution if possible.

websites usernames , passwords should never saved in app or in machine. it's not secure.

in response comment:-

once user go offline, need store username , passwords. this, need database data persist, , available when user login next time.
store data in encrypted format highly sensitive.
can explore h2 database engine, in-memory database , support encryption.


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