returning a Void object

Question

What is the correct way to return a Void type, when it isn\'t a primitive? Eg. I currently use null as below.

interface B{ E method();          


        

Answer 1

There is no generic type which will tell the compiler that a method returns nothing.

I believe the convention is to use Object when inheriting as a type parameter

OR

Propagate the type parameter up and then let users of your class instantiate using Object and assigning the object to a variable typed using a type-wildcard ?:

interface B{ E method(); }

class A implements B{

    public T method(){
        // do something
        return null;
    }
}

A a = new A