I don't see any error on your code, everything is well written and simple. Except trying putting PUBLIC on your Class displayer. If you encounter the same problem again try to rebuild your whole code and try to recompile the whole code. Even try restarting your personal computer.
Answer:
-checking social media networks during working hours
-surfing the Internet during working hours for what to do on the weekend
-downloading a favorite band’s latest album from a file-sharing service
Explanation:
they are all correct on edg.