Object Oriented Programming - Constructors & Destructors

Q3M1 – OOP C# Dudy Fathan Ali S.Kom
Constructors & Destructors
Q3M1
Dudy Fathan Ali, S.Kom (DFA)
2015
CEP - CCIT
Fakultas Teknik Universitas Indonesia

Constructors
Class UsingConstructor
{
public UsingConstructor()
{
Console.WriteLine(“Constructor
Invoked!”)
}
public void Display()
{
Console.WriteLine(“Display.”);
}
}
Output :
Class Program :
UsingConstructor uc =
new UsingConstructor();
Constructor Invoked!
A constructor is a special type of method that is invoked when you create a new
instance of a class. A constructor is used to initialize the members of the class. The
name of a constructor is the same as the name of the class that contains it.
~ OOP C# NIIT Courseware MMSv2

Constructors
A constructor is a special type of method that is invoked when you create a new
instance of a class. A constructor is used to initialize the members of the class. The
name of a constructor is the same as the name of the class that contains it.
Class UsingConstructor
{
public UsingConstructor()
{
Invoked!”)
}
{
Console.WriteLine(“Display.”);
}
}
Output :
Class Program :
UsingConstructor uc =
new UsingConstructor();
uc.Display();
Constructor Invoked!
Display.

The Need of Constructors
Class Calculator
{
int num1, num2, total;
public Calculator()
{
num1 = 10;
num2 = 20;
}
public void addNumber()
{
total = num1 + num2;
}
{
Console.WriteLine(“The total
is : ” + total);
}
}
Output :
Class Program :
Calculator objCal = new
Calculator();
objCal.addNumber();
objCal.Display();
The total is : 30

Constructors with Parameters
Class ConstructParam
{
int num;
public ConstructParam(int x)
{
num = x;
}
{
Console.WriteLine(“The number
is : ” + num);
}
}
Output :
Class Program :
ConstructParam cp = new
ConstructParam(20);
cp.Display();
The number is : 20
A constructor can be modified to accept the user supplied values at runtime.

Destructors
Class UsingDestructors
{
public UsingDestructors()
{
Invoked.”);
}
~UsingDestructors()
{
Console.WriteLine(“Destructor
Invoked.”);
Console.ReadLine();
}
}
Output :
Class Program :
UsingDestructors ud =
new UsingDestructors();
Constructor Invoked.
Destructor Invoked.
Destructors are special methods that are used to release the instance of a class
from memory. The purpose of the destructor is to perform the required
memory cleanup action.

Destructors
Class UsingDestructors
{
public UsingDestructors()
{
Invoked.”);
}
~UsingDestructors()
{
Console.WriteLine(“Destructor
Invoked.”);
Console.ReadLine();
}
}
Output :
Class Program :
UsingDestructors ud =
new UsingDestructors();
Constructor Invoked.
Destructor Invoked.
The programmer has no control on when to call the destructor. The .NET
Framework automatically runs the destructor to destroy objects in the
memory.
Tilde Symbol

Thank You!
Dudy Fathan Ali S.Kom
dudy.fathan@eng.ui.ac.id

Object Oriented Programming - Constructors & Destructors

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