VB.NET tutorial-Interface

Object-Oriented Programming (OOP)

Interface

An interface can be used as a template for other classes. Its purpose is to be inherited. It sounds like an abstract class. However, in the interface, you cannot declare variables unless they are constants. In addition, methods can be declared, but those are without bodies.

Example:
Module Module1

    Sub Main()
        Dim d As New Dog
        d.setnumberOflegs(4) 'setnumberOflegs was inherited from the Animal class
        d.setdogName("Aluk")
        Console.WriteLine("Dog Name: " & d.getdogName())
        Console.WriteLine("Number of legs: " & d.getnumberOflegs())
        'getnumberOflegs was inherited from the Animal class

        Console.ReadLine()
    End Sub

    Class Animal : Implements AnimalTemp 'Implement the interface

        Private numberOflegs As Integer

        Public Sub setnumberOflegs(ByVal n As Integer) Implements AnimalTemp.setnumberOflegs

            numberOflegs = n
        End Sub

        Public Function getnumberOflegs() As Integer Implements AnimalTemp.getnumberOflegs

            getnumberOflegs = numberOflegs

        End Function

    End Class

    Class Dog : Inherits Animal

        Private dogName As String

        Public Sub setdogName(ByVal name As String)

            dogName = name

        End Sub
        Public Function getdogName() As String

            getdogName = dogName
        End Function

    End Class

'Defining interface AnimalTemp
    Interface AnimalTemp

        Sub setnumberOflegs(ByVal n As Integer)
        Function getnumberOflegs() As Integer

    End Interface
End Module

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Posted comments

Phan Neth, CICI, year 3:

Now it is ok teacher. I can connect to database and select data from it. Than you so much teacher !!!!!

04-30-2013

Dara:

Copy and paste the link below to the address box to learn how to connect C and Mysql server:
http://www.worldbestlearningcenter.com/index_files/cpp-tutorial-connect_mysql_database.htm

04-27-2013

Phan Neth, CICI, year 3:

Hello teacher i want to connect C programming language to MySql server but it have problem. When i compile it always error with library " my_global.h
and mysql.h", so how should i do?

04-27-2013

Phan Neth, Year 3 at CICI,:

I have some problem about connection to mysql server. So I hope teacher can help me. Thank !!!!

04-26-2013

Federico:

Output appears the same also this way:

static void Main(string[] args)
{
int[,] myArray = new int[5, 5];
int row, i;
int n = 1;

for (row = 0; row < 5; row++)
{
for (i = 0; i < 5; i++)
{
myArray[row, i] = n;
if (row == 1 && i == 2) Console.Write(" \t");
else Console.Write("{0} \t", n);

if (n!=26) n++;
if((i+1)%5==0) Console.WriteLine("\n");
}
}
Console.ReadLine();
}

04-13-2013

Dara:

Let pointer p point to the index 1 elem (value=2) of the array.
int *p= a+1;
Let pointer q point to the index 6 elem (value=5) of the array.
int *q= a+6;
-Expression q-p is the subtraction of address of the index 6 element and the address of index 1 elem of the array. So, the result is 5.
-Expression *p+*q is the sum of the value of index 1 elem (2) and the value of index 6 elem (5). So, the result is 7.
In conclusion, the output is 57.

03-28-2013

Anushka :

Find the output of following code
main()
{
int a[] = {1,2,9,8,6,3,5,7,8,9};
int *p= a+1; int *q= a+6;
cout<< q-p <<*p+*q; }

03-28-2013

Dara:

Option Explicit
Dim Cn as New ADODB.Connection
Private Sub_Form_Load()
Cn.Open "Provider=SQLOLEDB; Data Source=ServerName; Initial Catalog=DatabaseName;UserID=UserName; Password=Passw"
End Sub
You will need to replace ServerName with the name of your server (installed SQL Server), DatabaseName withe the name of your data file that you want to connect to, UserName with the name of the user to login to SQL Server, and Passw with the password used to login to SQL Server.

03-13-2013

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VB.NET tutorial-Interface

Object-Oriented Programming (OOP)

Interface

VB.NET programming tutorial

Posted comments