Why my code does not work

Question

https://code.sololearn.com/c8mExPh8d1PZ/?ref=app

Answer 1

SoloLearn Code Playground only supports console code.

Answer 2

You use javax.swing.*
it doesn't support on Sololearn and btw curly braces error.

Answer 3

Support only console codes.

Answer 4

Thanks!!!