1. Applications Development
Using VB .Net
Note:
The prerequisits of this course are CMP210, CMP218 or CMP219 and CMP252

2. Learning new languages

3. Computer Programming Languages
Can be classified into two basic types
Object Oriented Programming
Procedural Programming
Each computer language classified under each “type” will follow specific guidelines.
knowing the specific guidelines within a language type will help in learning the different languages within each type.

4. Computer Programming Languages (Continued)
Procedural Languages
Examples include
PASCAL C
COBALD
Follow a top down design
Object Oriented Languages
Follow OOD (Object Orient Design)
C++
Java
VB .Net

5. Object Oriented Languages Overview (Review questions)
Some questions that should be answered as a review.
What is OOP (Object Oriented Programming)?
What are Data Types (Primitive and Abstract)?
What is the String Data Types and its associated methods?
How do you convert numeric data from a String to a Primitive data type?
What is the difference between a class and an object?
What are attributes?
What are methods?
What is a constructor?
What is an Accessor?
What is a Mutator/Modifier?
What is inheritance?
What are loops?
What is Exception Handling and Why is it used?
What does public and private mean?
What are control structures (if and switch statements)
What are the following operators
Assignment?
Math?
Comparison/Logical?
Boolean?

6. Classes in OOP Are object descriptions
Contain both attributes and methods
Attributes are data types that describe the object
Can be both Primitive data types and other classes
Can be public or private
Methods are the actions that the object can do
Three types of methods
Constructor
Accessor
Mutator/Modifier
Every method contains a specific format
Every method contains an accessibility (public/private)
Every method contains a parameter lists (lists can be empty)
Every method contains a return type (can be void or nothing)

7. Comparing VB .net and Java
Learning VB .net
Comparing VB .net and Java

8. Similarities of VB .net and Java
Both are object oriented
Both have public and private methods and attributes in a class
Both use exception handling
Both are event driven programming languages

9. Noticeable differences between Java and VB .net
VB .net does not use semicolons
VB .net does not use curly braces
VB .net is not case sensitive
VB .net contains both Sub Procedures and Functions
VB .net primarily contains a visual interface for the programmer
VB .net runs on multiple platforms containing the VB .net environment
Every program in this class will start off with a form.

10. Primitive Data Types in Java
int
float
double
boolean
byte
char
Long
Etc.

11. Primitive (elementary) Data Types in VB .Net
Integer
Boolean
Decimal
Date
Double
Char
String
Etc.

12. Converting Data Types in VB .net
Functions are used to convert text (String) data to numeric data
These functions include
CInt()
CDec()
CLng()
Etc. (in text on page 485)
These functions in VB .net behave much like the parsing methods in Java.

13. Operators in VB .net Math Assignment + - * /
Mod (Modulus or Remainder)
Assignment =

14. Operators in VB .net (continued)
Comparison
= (the same as assignment)
<
<=
>
>=
<> (Not equal)
Boolean (uses words not symbols)
And Or
Not

15. Variable declarations in VB .net vs. Java
In java the data type is placed before the label
int num1;
In VB .net
All variable declaration requires the keyword Dim (stands for Dimension)
the label is placed in front of the data type
Option Explicit and Option Strict should be also turned on at the top of every class
Dim num1 As Integer

16. Method Syntax in Java public int Sum3 (int num1, int num2, int num3) {
int answer;
answer = num1 + num2 + num3;
return answer; }
The return type is an integer
The number of parameters are 3 integers
The method is public

17. Methods in VB .net
VB .net have two specific types of methods for classes
Each method could still be
A Constructor of a class
An Accessor of a class (Called Property get)
A Mutator/Modifier of a class (Called Property set)
The two specific types are
Sub procedures (do not return a value)
Functions (return a value)

18. Functions in VB .net Functions can be both public and private
Functions return a value
The return type of the Function is always at the end of the method heading (different than Java)
Only one value may be returned from a Function
Functions contain a parameter list

19. Method (functions) Syntax in VB .net
Public Function Sum3(num1 As Integer, num2 As Integer, num3 As Integer) As Integer
Dim answer As Integer
answer = num1 + num2 + num3
return answer
End Function
This Function is public
This Function contains 3 parameters of type Integer
This Function has a return type of an Integer

20. Specifics for developing windows applications
VB .Net
Specifics for developing windows applications

21. Forms in VB .Net Every form in VB .net is a class
Forms have default attributes (properties) and methods (sub procedures and functions)
Properties can be set with the properties Window in the .net development environment

22. Forms in VB .net (Continued)
Properties that can be set are
Text (Title in the title bar)
Background color
Name of the form (Like java should match the name of the file (class name)
Size
Icon (in the Title bar)
Etc.
Forms can also have attributes (properties) and methods (Functions and Sub Procedures) added to them

23. Controls in VB .net
Items added to the form such as text boxes are called controls
Each control added to a form becomes an attribute of that form (or part of the form)
Each Control is an Object and have
Attributes (properties)
Methods (Functions and Sub-Procedures)

24. Controls in VB .net (Continued)
All properties can be set by using the properties window for each control.
Controls in VB .net include
Text Boxes
Buttons
Data Grids
Etc.

25. Text Boxes Used for entering text for a windows application
ALL Data entered in the text box is a String (like with JOptionPane)
All numeric data must be converted with the methods described earlier
The Text attribute will hold the Data entered into the text box

26. Events and Windows Applications
Windows is an event driven operating system (Flow of control is driven by events that occur)
Events are messages that are passed to applications and objects when something in the program occurs
Events can be a mouse click, positions of the Mouse etc.

27. Buttons and Event handling
By double clicking on the Button control on the form, sub program headings for handling the click event are inserted.
All code that is entered into the event handler will only execute in the program when the button is clicked.
another event that is handled in programs written in class is the Form load event.

28. Control Structures in VB .net
Similarities and differences between Java and VB .Net

29. If statements in Java if (num1 == 4) {
System.out.println(“num1 is 4”);
}else
System.out.println(“num1 isn’t 4”); }

30. If Statements in VB .net If num1 = 4 Then MessageBox.Show(“num1 is 4”)
Else
MessageBox.Show(“num1 isn’t 4”)
End If

31. VB .net If statements (continued)
Again no semicolons
No curly braces
End If ends the if statement
Single equal sign is used for comparisons and assignments