Question: I need to make a JAVA GUI program where the user must register and then login. I already made a txt file to save the

I need to make a JAVA GUI program where the user must register and then login. I already made a txt file to save the users' data once registered. But i need a code for that checks for the password and username validity (password must be the one registered with username) once the user logs in. If the password or username is incorrect then an error pops up telling them to re-enter.

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