Overriding replaces a superclass method with a version that fits the subclass. The name, parameters, and return type must match. Put @Override above the method so the compiler checks that a superclass method really exists.
The method that runs depends on the object's actual class, not the type of the variable. A Person variable that points at a Mentor still runs Mentor's version.
Example
The variable type is Base, but the object is a Lead. role() uses the override and prints mentor.
class Base {
String role() { return "person"; }
}
class Lead extends Base {
@Override String role() { return "mentor"; }
}
public class Dispatch {
public static void main(String[] args) {
Base who = new Lead();
System.out.println(who.role());
}
}Overloading picks a method at compile time from the argument types. Overriding picks a method at run time from the object. They solve different problems.
