How to use fragments in an activity which already extends another class?

Question

To use fragments in an activity, we need to extend Fragment in that activity. But my activity already extends another class, and java cannot extend 2 classes. So how to use fragments inside an activity that already extends another class?

Answer 1

Multiple inheritance (more than one parent class) was tried in C++ and gave some interesting challenges, so the Java designers decided to try "interfaces" instead.

For your actual problem, have a Fragment object inside your own object and invoke the methods you need.