Writing Classes combined with Arrays of objects, UML and flowchart diagrams
(chapters 5 and 7 [L&L 6th ed chapters 4 and 7] [L&L 7th ed chapters 4, parts of 7 and 8 ])
Declaring a variable as reference
object of parent class, creating the object as instance of child class - examples.
OTesterPolym.java, uses
OChild.java, OParent.java
DrawingPanel.java (this class is just to be used;
you are NOT expected to understand all its details but just enough to use it. See other classes
on how to use this one.)