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The posted code is a mess. I suggest you start over.

Make a list of what the class needs to do. This list would be used to define the variables and methods needed in the class. There should NOT...

How does the value you enter in the dialog window get to the code that computes the values that are printed out?

Follow the code following the call to JOptionPane to see where the entered values...

can you copy the contents of the command prompt window that shows the input and output from the program?
Add some comments to it that shows what is wrong with what the program does.