Interface can extend more than one Interface but Class cannot
Answer: It is the bad experience from C++ where this is possible but Java does not allow to do this.
The another approach for multiple inheritance is that a class can implement multiple interfaces (or an Interface can extend multiple Interfaces)
Actual confusion starts when interface define same methods and extends multiple interfaces.
Not only interfaces, A single class can also implements multiple interface. Then obviously a doubt raises, what if two methods have an same method name.
Important: Single implementation works for both.