Introducing Code Programming

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Tutorial 5

• Introducing Code Programming

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What is Class

• Building blocks of a program
• Provided by VB .Net Framework Class Library
• Template definition of the methods and variables
  in a particular kind of object
• VB Windows forms inherit definitions from the
  System.Windows.Forms.Form class.

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Object-Oriented Programming (OOP)

• Programming language model
• Organized around "objects" rather than "actions"
  and data rather than logic
• Subclass and inheritance

Class 1 Class 2
Food Fruit Apple Machine Computer Apple
Sources techtarget.com
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• Polymorphism Actions or behaviors that share the
  same essence would have a common name even though
  they belong to different objects.
• E.g., opening (action) a computer application
  (object) is different from opening a door in
  terms of operations. However, the name of the
  action for both objects is open since the idea is
  the same.
• ComputerApplicatoin.Open
• Door.Open

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Structures of OOP

• Action
• Object.Behavior
• Object.Method
• Value
• Object.Property
• Object.Attribute

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Val and Str Functions

• Val Returns a numeric value of an argument
  (string value)
• E.g. Val(123) ? 123
• Str Returns a string value
• E.g. Str(123) ? 123