Why can't we instantiate an abstract class in Java?

Question

I understand:

1. Since an abstract class is nothing on its own, e.g. vehicle, we want to create an object of an concrete implementation, like Car, Bike, etc.

Answer 1

Because an Abstract Class is a skeleton structure(an incomplete construct if you may), hence the term Abstract.

abstract class Person(){
   abstract void Speak();
}

Means every Person must speak. That means every person should know how to speak (implement the speak()). new Person() cannot have that, so it is not allowed.