If we run an unextended abstract class will it throw an error?

Question

public abstract class Customer {
private string name;
public Customer (String name){
this.name = name;
}
public String getName(){
return name;
}
public abstract void buy();
}

Answer 1

if the given code does not give error by compiler..
related to abstract class.

jvm only run psvm()
only
so give code is compile and execute
without doing anything..
.

Answer 2

this is a challenge question so what's main problem...

Answer 3

You can't create instance of abstract class, so as long as there's no "new Customer()" it should work.

Answer 4

yes it was a challenge question .
I think we can not run an abstract class. While the code compiles fine.
Am I right?