Object Oriented Programming - Constructors & Destructors
Download as PPTX, PDF1 like405 views
1) Constructors are special methods that are invoked when a new instance of a class is created. They are used to initialize member variables and have the same name as the class. 2) Destructors are special methods that are used to perform cleanup actions like releasing memory when an object is destroyed. They are prefixed with a tilde symbol and have the same name as the class. 3) The document provides examples of using constructors with and without parameters, and destructors. It explains that destructors are automatically called by the .NET framework to destroy objects in memory.
Ad
More Related Content
What's hot (19)
Viewers also liked (20)
Ad
Similar to Object Oriented Programming - Constructors & Destructors (20)
Ad
More from Dudy Ali (20)
Recently uploaded (20)
Object Oriented Programming - Constructors & Destructors
- 1. Q3M1 – OOP C# Dudy Fathan Ali S.Kom Constructors & Destructors Q3M1 Dudy Fathan Ali, S.Kom (DFA) 2015 CEP - CCIT Fakultas Teknik Universitas Indonesia
- 2. Constructors Q3M1 – OOP C# Dudy Fathan Ali S.Kom 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
- 3. Constructors Q3M1 – OOP C# Dudy Fathan Ali S.Kom 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 Class UsingConstructor { public UsingConstructor() { Console.WriteLine(“Constructor Invoked!”) } public void Display() { Console.WriteLine(“Display.”); } } Output : Class Program : UsingConstructor uc = new UsingConstructor(); uc.Display(); Constructor Invoked! Display.
- 4. The Need of Constructors Q3M1 – OOP C# Dudy Fathan Ali S.Kom Class Calculator { int num1, num2, total; public Calculator() { num1 = 10; num2 = 20; } public void addNumber() { total = num1 + num2; } public void Display() { Console.WriteLine(“The total is : ” + total); } } Output : Class Program : Calculator objCal = new Calculator(); objCal.addNumber(); objCal.Display(); The total is : 30
- 5. Constructors with Parameters Q3M1 – OOP C# Dudy Fathan Ali S.Kom Class ConstructParam { int num; public ConstructParam(int x) { num = x; } public void Display() { 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. ~ OOP C# NIIT Courseware MMSv2
- 6. Destructors Q3M1 – OOP C# Dudy Fathan Ali S.Kom Class UsingDestructors { public UsingDestructors() { Console.WriteLine(“Constructor 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. ~ OOP C# NIIT Courseware MMSv2
- 7. Destructors Q3M1 – OOP C# Dudy Fathan Ali S.Kom Class UsingDestructors { public UsingDestructors() { Console.WriteLine(“Constructor 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. ~ OOP C# NIIT Courseware MMSv2 Tilde Symbol
- 8. Q3M1 – OOP C# Dudy Fathan Ali S.Kom Thank You! Dudy Fathan Ali S.Kom [email protected]