java void and void uppercase V and lowercase V

    private void InitValue () {
        phonestring = Phonefield.gettext (). toString (). Trim ();

    }

    Private class Requestgetposttask extends Asynctask<void, void, void>{

        @Override
        protected void Doinbackground (Void ... params) {return
            null;
        }

    }

Look at the code above:

Void is a method return value type

Void can be used as a class

Void x = Null;//correct

Void is generally used as a parameter type

protected void Doinbackground (void ... params) {
return null;
}

    Void is also the return type here, why?

If you want a method to return a type that is always null, you can place the return type as void

Void is an automatic boxing type void (autoboxing feature) (since JDK 1.5)

 Void function (int a, int b) {
    //do something return
    null;
 }