Here is a simple java program that is built using Jframe, It texts error handling I was testing out try and catch to see if the input that the user puts in is it numeric or not.
Was creating a simple GUI that is interactive and tallies the total per click. Using JFrame trying to make a good UI, adding other features of clearing the menu and also being able to exit . It counts the tax and also change when cash is tendered.
I made a simple tenant booking system using JFrame was working with a real SQL Oracle DB, The system you can input user details then after that it can tally up the total of the costs after that you can book a tenant and save it to the Database, also other CRUD operations can be done.
