Generic class that extends class and implements interface

Question

To reduce dependece of class, I want to send parameter (using generic class) to constructor that extends some class and implements interface, for example

public interface SomeInterface{     public void someMethod(); }  public class MyFragment extends Fragment implements SomeInterface{     //implementation }  //here is classs, that I need to create. T must extend Fragment and implements  //SomeInterface. But, I'm afraid, if I'll use MyFragment directly, it will create a //dependence of SomeClass from MyFragment.  public class SomeClass /*generic?*/ {     public SomeClass(T parent); } 

Is it possible?

Futher, using my T class, I want to create views, using T.getActivity() as Context.

Answer 1

T must extend Fragment and implement SomeInterface

In that case you could declare SomeClass as the following:

public class SomeClass<T extends Fragment & SomeInterface> 

That would require an object of type T to both extend Fragment and implement SomeInterface.

Further, using my T class, I want to create views, using T.getActivity() as Context.

I'm unfamiliar with Android, but if getActivity() is a public instance method declared in Fragment then will be entirely possible to call it on an instance of T, since the compiler will know all Ts must inherit that method.