Want to know about how to implement the concepts.

Question

I want to know about do the file operations using the below concepts but i am having many doubts from this.first i want to know about how to implement the  file related operation in the below concepts 

 

1.Abstract class

2.Interface

3.Method overloading

4.Operator overloading

 

 

i want to know the breif explanation of the concepts. i anyone know how to implement the file related operation though file concept please reply soon as possible... :)