Programming with Class-based Objects

Object-oriented Programming

Once an instance of a class is created, or static class members are initialized, you can access the data members, properties, methods, and events of the class.

In this section:

Instantiating and managing class-based objects

Verifying the type and validity of an object reference

Using built-in system and object reference elements

Assigning object references

Comparing objects

Using static members of a class

Defining and using widgets in classes

Using preprocessor features in a class

Raising and handling error conditions

Reflection: using built-in ABL classes

Using the Progress.Lang.ParameterList class

Understanding classes in the Progress.Reflect package

Serialization and deserialization