UML diagram for the fruit program. 

The Apple, Orange, and Grape classes are derived from the base Fruit class.
This inheritance is represented by the is-a relationship, that is,
an Apple is-a Fruit, an Orange is-a Fruit, a Grape is-a Fruit.
UML notation for inheritance is the arrow
(note arrowhead should have a bottom like a pyramid).

Fruit objects are part-of a List object.  There are possibly many
Fruit objects (represented by the asterisk) in one List object.
UML notation is the line with a diamond on the end.


                      +---------+                 +---------+                 
                      |         | *            1  |         |                 
                      |  Fruit  |---------------<>|  List   |                 
                      |         |                 |         |                 
                      +---------+                 +---------+                 
                       ^   ^   ^
                     /     |     \
                   /       |       \
                 /         |         \
               /           |           \
             /             |             \
    +---------+       +---------+       +---------+       
    |         |       |         |       |         |       
    |  Apple  |       |  Orange |       |  Grape  |       
    |         |       |         |       |         |       
    +---------+       +---------+       +---------+