Visual%20Basic%20vs%20JAVA

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Visual Basic vs JAVA

• Namon Nuttayasakul
• Myat Min

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Introduction

• Visual Basic is a software development system
  developed by Microsoft to support creating
  programs for the Windows operating systems

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History of Visual Basic

• VB version 1 a custom-control edition
• VB version 2 introduced the OOPS
• VB version 3,4 business orientation
• VB version 5 is a big breakthrough of OOPS
• VB version 6 the network version of VB.

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VB as an OOPS

• OOPS (Object Oriented Programming Systems)
• Microsofts object Basic
• Visual Basic for Application (VBA)

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Object

• A data type with intelligence.
• An example of object is
• Spread Sheet

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Creating an object in VB

• General process to create object variable
• Create an object variable (Dim).
• Allocate an object in memory with New or
  CreateObject , and then assign it to the object
  variable.

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Creating an object in VB
ObjectVariable
?
Create an object variable
Dim ObjName As Object
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Creating an object
Object of type myClass
ObjVariable
Allocate an object in memory with New
Set ObjVariable New myClass
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Three ways to create an object

• Use Dim and New together
• Dim objectName As New className
• Using New
• Public objectName As New ClassName
• Using CreateObject
• Set fso CreateObject(Scripting.FileSystemObjec
  t)

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Object type

• Collection object
• Class

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Defining a New Class

• JAVA uses block of keyword class statement
• VB uses Class Module

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Class module
Declare property Property Get read
only Property Let write-only Both
read-write Private m_Sam As Long Public
Property Get SamAccount() As Long Sam
m_Sam End Property Public Property Let
SamAccount(ByVal newVal As Long) m_Sam
newVal End Property

• Class module for Stack
• Stack object

Properties
Methods
?
Read-only
Count
Push
sub
Read-write
function
Item
Pop
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3 OOPS major features

• Encapsulation
• Inheritance
• Polymophysm

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Encapsulation

• Stack Object

Methods
Properties
?
Push
Count
Pop
Item
Hiding implementation
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Inheritance
Push
new code
Pop
Count
Object of existing class
Item
New Object
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Polymorphism

• ListBox.Property Let Visible
• CompBox.Property Let Visible
• Picture.Property Let Visible

Ctrl 1
Ctrl 2
Ctrl 3
Early Binding
Substiture any class Property Let Visible Is
search for at run time, In the list of
procedures Supported by item
Property Let Visible
item
Late Binding
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Conclusion
FUNCTIONS VB JAVA
Complete object-oriented No Yes
Cross-platform compatible No Yes
Distributed Yes Yes
Ease to use Easier Harder
Secure Poorer better