Eclipse issue

Question

I am switching over to Eclipse (Neon.2 Release 4.6.2) from Notepad++.
A file in cmd compiles perfectly fine. But it does not in Eclipse. When i click Run(ctrl+f11), it displays java.lang.Error: Unresolved compilation error and the line marked as wrong is line with main method. (257)
https://code.sololearn.com/c0B57mLKsNDs/?ref=app

Answer 1

I just switched to atom for notepad++ recently.
So far I like it.

Answer 2

Try to execute Project/Clean menu item.