How can I see the source code of other Java programs?

Question

I use Netbeans and I want to import good programs with user interfaces, to learn of them. how can find the code with src,lib, etc files that i could import?
Could you advise me any interesting code?

Answer 1

u can "pull" some projects from GitHub to run and test, if u dont know what is github, try some youtube tutorials, u can use it to any programming language