Changing array in .java file from user input

Question

How do I make my code save a new user's username and password to the array so that it actually adds it in the code too. That way the next time the code is ran, that new user is no longer a new user, and can just type in their username and password that they saved? I have most of it done, with some help. But I don't know how to actually save it in the code.

https://code.sololearn.com/cx4eCiJ5fBj6/#java

Answer 1

You need to handle it with writing and reading files.
You can do it in a console (install IDE and run in a computer)
But not on sololearn code playground.

Answer 2

I use BlueJ on my pc