Spider moiré pattern

I am aware that Java cannot run in Arduino. I have been trying to translate it without much success. I am needing help, not mocking please. I am disabled and trying to learn a new language. Right now I am getting

C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/main.cpp:43: undefined reference to `setup'

C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/main.cpp:46: undefined reference to `loop'

collect2.exe: error: ld returned 1 exit status

And I have void setup() and void loop() installed correctly.