What's difference between java and c# ?

Answer 1

they are same in many ways at least they are both object oriented and both programing level are similiar. Csharp works on microsoft systems while java can run on any platform after you run java virtual machine (jvm) at the background.

both easy to learn hard to dig nearly limitless and best both have garbage collector which you don't need to think about memory issues (sort of) :)

Answer 2

It's a different language :P Different programs use different languages. For example Unity has C# and Android Studio has Java (iirc haha). It's preference and depends on what kind of project you are doing.