Booa8 Slide 02

Buliding Object-Oriented Applications in PowerBuilder Module 2: Objects And Classes

Objectives ,[object Object],[object Object],[object Object]

Topics: Objects and Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Objects — Definition ,[object Object],[object Object],[object Object],[object Object]

Classes — Definition ,[object Object],[object Object],Class Definition Object Instance

Defining Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

New Objects Created Through Inheritance

Defining Classes ,[object Object]

Syntax — Window Subclass of window class Class properties changed

Defining Classes ,[object Object],[object Object],[object Object]

Adding Properties — Instance Variables

Methods of a Class ,[object Object],[object Object],[object Object],[object Object]

System Methods ,[object Object],[object Object],Show/Hide Prototype Cannot Modify Arguments

Adding Methods — Events ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Mapped Events ,[object Object],[object Object],[object Object],[object Object]

Unmapped Events ,[object Object],[object Object],[object Object],[object Object]

User-Defined Events Mapped or Unmapped Events Determined

Adding Methods — Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adding Methods — Object Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adding Methods — External Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Adding Methods — External Functions

Summary Events Yes (v8) Yes (v8) Yes Yes Yes Class Application Menu UserObject Window Window control Instance Variables Yes Yes Yes Yes No Object Function Yes Yes Yes Yes No External Function No Yes Yes Yes No

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lab Setup ,[object Object],[object Object],[object Object],[object Object],[object Object]

Lab Debriefing ,[object Object]

Lab Debriefing ,[object Object],Can you access these properties using direct access? Should you? But can you? What are some disadvantages of not fully encapsulating these?

Booa8 Slide 02

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