I'm in 2nd year of bachelor and working on my final project which is on the end of 3rd year.. But the project is on Java. I want to make it run in my laptop and on my phone. But I have a Microsoft Lumia 640. And I know how to create apps for my phone just in C#. Is it possible to design a mini software, and run it inside a C# app in my phone?
No, natively Windows Phone doesn't support Java but you can take a look to codename one where in their manifesto says that you will able to make mobile application for any platform only using java.