To make the printOn() function more useful in application programs, it
has been changed to print minimal formatting information, the idea being that
this can frequently be added by an application to suit its specific needs.
The virtual function dumpOn() has been added to assist in debugging by
printing more detailed information than printOn().
Object::dumpOn() prints the name of an object's class, a left square
bracket ("["), calls printOn(), then prints a matching right
square bracket and a newline ("]
n"). Collection::dumpOn()
does the same, except that it applies dumpOn() to all objects in the
collection instead of calling printOn(). Other classes reimplement
dumpOn() to print more appropriate information.
By default, dumpOn() sends its output to cerr. A default
argument has also been added to printOn() so that it writes to
cout by default.