Does the object type known during compilation in Java?.

class A {

}

class B extends class A {

}

class checkType

{

public static void main(String[] args)

 {
   A ObjA = new B();/// Here ObjA is of type A--> this fact is  known at compile time.
                        But here ObjA is pointing to new B(). Will this be known at  
                        compile time or run time.
 }

}