Java.lang.ClassCastException

Refers to a type conversion error

Occurs when the current person's domain is less than the latter

For example, the former is a subclass object, and the latter is the object of the parent class.

If a = B is used, a java.lang.ClassCastException is thrown.

List<customervo> customers=  (list<customervo>) new Customervo (); List<customervo> customers = new arraylist<customervo> ();

One of the above notation is to report such a mistake, because Customervo does not belong to the list of subclasses

Java.lang.ClassCastException