please answer the questions in JAVA only and help me.(AOOP)

Answer properly please.

You have to create a mobile banking app. In the first scene, if you provide your registered phone number and password and then press the Log IN button, it will bring you into the second scene. Registered phone number, password and other information is stored in user.txt file. In the second scene, there are three labels with ??? mark that will fill up with user info from the file, and two buttons will bring you into the third scene. Welcome ??? Phone: ??? Balance: ??? In the third scene, after providing all the information if all constraints are satisfied then pressing Done button your balance will deducted and you go to the dashboard