In Object-Oriented Programming, a virtual function is initially defined in a base class, and can be redefined in derived classes, so that when a virtual function is invoked, the function defined in the receiver's class is executed.
In Object-Oriented Programming, a virtual function is a function that is initially defined in a base class, and can be redefined in derived classes, so that when a virtual function is invoked, the function defined in the receiver's class is executed.
For example, in Java the virtual function toString() is defined in the root class Object, and any class may redefine this function to provide a meaningful text representation of an object of that class. (Some classes do not redefine toString(), using the default implementation instead.)
