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Did you try adding some println statements so you can see what the code is doing?

How are you trying to debug the code? I use println() statements to print out the values of variables are they are changed and used.
Add some println() statements that print out the values of the...

Please copy and paste what is printed, not images. It is not possible to copy text from an image to include in a response.

Can you copy the full contents of the command prompt window from when you execute the program and paste it here?

Add println statements that print what is shown in the JOPtionPane windows.