Application Class

What is an Application Class ?

Benefits of Application Class

Application Class Structure

Terminologies

System variables & Overriding Properties

Questions ???

Application ClassApp Class is a PeopleCode Program at base level

Ability to reuse – by writing Generic Code. Base classes are defined in a way that can be reused

Easy to Maintain – since all common code resides at one place.

Inheritance – Extensibility

Encapsulation – Ability to hide implementation details while extending the class; this is implemented through Private Instance variables and private methods.

Dynamic Execution – Call dynamic methods based on system variables.

General Class Structure

Imports

Class Name

Class Extensions

Declaration of Public External interface

Declaration of private instance variables and methods

Definition of Methods

Constructors

General Class Structure contd…

Subclass:

An Extended Class – Inherits all the public

properties and methods from the extended class

SuperClass: Class being extended

Methods :

1. Procedure or set of PeopleCode – activated by an Object

2. Methods parameters can be passed by Reference or passed by value

Property: Attribute of an Object

Constructors:

1. A method with in a Class – holds the same name as the Class

2. Executed once an Object is instantiated for the Class – Objects are activated using the keyword Create ()

3. Used to initialize default values for Properties & Instance variables

System Variables:

%This

%Super

Class Definition

Class Constructor

Property – Get / Set

Calling Base Class

Class Extension

Instantiate Parent/Base class from Extended Class

Override Method in Extended Class

Call common method from Extended Class

Question 1

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Question 4