Constructor vs. Destructor: Know the Difference
By Shumaila Saeed || Updated on December 25, 2023
Constructor is a special method in object-oriented programming used to initialize a new object. Destructor is a method in object-oriented programming that is invoked when an object is being deleted or destroyed.
Key Differences
Constructors are special methods in object-oriented programming (OOP) used to initialize newly created objects. They set initial values for object attributes and allocate any necessary resources. Destructors are also special methods in OOP, but they serve the opposite purpose. When an object is no longer needed, destructors are called to release resources and perform clean-up tasks.
Shumaila Saeed
Nov 22, 2023
In most OOP languages, constructors are called automatically when a new object is created. They can be overloaded to allow different ways of initializing an object. Destructors, on the other hand, are called automatically when an object is about to be destroyed, typically when it goes out of scope or is explicitly deleted.
Shumaila Saeed
Nov 22, 2023
Constructors play a crucial role in setting up an object for use, often ensuring that the object starts in a valid state. Destructors ensure that once an object is done being used, it gracefully releases its resources, like memory or file handles, back to the system.
Shumaila Saeed
Nov 22, 2023
While constructors can have parameters and can be overloaded, destructors typically do not take parameters and cannot be overloaded. Constructors prepare an object for its lifecycle, whereas destructors gracefully end that lifecycle.
Shumaila Saeed
Nov 22, 2023
The concept of constructors and destructors is central to resource management in OOP. Constructors initialize objects and allocate resources, while destructors are responsible for resource deallocation and cleanup, ensuring efficient memory management.
Shumaila Saeed
Nov 22, 2023
ADVERTISEMENT
Comparison Chart
Purpose
Initializes a new object.
Cleans up and releases resources of an object.
Shumaila Saeed
Nov 22, 2023
Timing
Called when an object is created.
Called when an object is destroyed.
Shumaila Saeed
Nov 22, 2023
Overloading
Can be overloaded with different parameters.
Cannot be overloaded.
Shumaila Saeed
Nov 22, 2023
Resource Management
Allocates and initializes resources.
Deallocates and cleans up resources.
Shumaila Saeed
Nov 22, 2023
Automatic Call
Automatically called at object creation.
Automatically called at object destruction.
Shumaila Saeed
Nov 22, 2023
ADVERTISEMENT
Constructor and Destructor Definitions
Constructor
Special block of code for setting up an object.
The User constructor initializes the user's name and age.
Shumaila Saeed
Nov 17, 2023
Destructor
A method invoked at the object's deletion.
The File destructor closes the file stream when the object is destroyed.
Shumaila Saeed
Nov 17, 2023
Constructor
A routine in OOP for object initialization.
In the Rectangle class, the constructor sets the length and width.
Shumaila Saeed
Nov 17, 2023
Destructor
A routine in OOP for object cleanup.
The destructor in the Logger class flushes and closes log files.
Shumaila Saeed
Nov 17, 2023
Constructor
A method that initializes an object upon creation.
The Car constructor sets the initial model and color of a new car.
Shumaila Saeed
Nov 17, 2023
ADVERTISEMENT
Destructor
A cleanup method in a class.
The Player destructor frees the allocated memory for the player's profile.
Shumaila Saeed
Nov 17, 2023
Constructor
An initializer method in a class.
The Book constructor assigns a title and author to each new book.
Shumaila Saeed
Nov 17, 2023
Destructor
A function called to release resources of an object.
The Window destructor deallocates the memory used for window elements.
Shumaila Saeed
Nov 17, 2023
Destructor
Special block of code for cleaning up resources.
The NetworkConnection destructor terminates the connection upon object destruction.
Shumaila Saeed
Nov 17, 2023
Constructor
To create (an argument or a sentence, for example) by systematically arranging ideas or terms.
Shumaila Saeed
Oct 19, 2023
Constructor
(Mathematics) To draw (a geometric figure) that meets specific requirements.
Shumaila Saeed
Oct 19, 2023
Destructor
An explosive, usually remote-controlled device for effecting a destruct.
Shumaila Saeed
Oct 19, 2023
Constructor
A concept, model, or schematic idea
A theoretical construct of the atom.
Shumaila Saeed
Oct 19, 2023
Constructor
A concrete image or idea
"[He] began to shift focus from the haunted constructs of terror in his early work" (Stephen Koch).
Shumaila Saeed
Oct 19, 2023
Destructor
(object-oriented programming) A function that runs when an object is no longer required, used to release any resources that it was using.
Shumaila Saeed
Oct 19, 2023
Destructor
A destroyer.
Fire, the destructor and the artificial death of things.
Shumaila Saeed
Oct 19, 2023
Constructor
(automotive) A company or individual who builds racing vehicles. In Formula One, constructor status is strictly defined by the rules, but in other motorsports the term is merely a descriptor. Depending on the racing rules, some constructors (e.g. Cosworth) may provide vehicles to racing teams who are not themselves constructors, while others are both teams and constructors (Ducati Corse, Scuderia Ferrari).
Shumaila Saeed
Oct 19, 2023
Constructor
(object-oriented programming) A class method that creates and initializes each instance of an object.
Shumaila Saeed
Oct 19, 2023
Destructor
In object-oriented programming, a function which destroys an object which was previously created by a different function.
Shumaila Saeed
Oct 19, 2023
Constructor
Someone who contracts for and supervises construction (as of a building)
Shumaila Saeed
Oct 19, 2023
Constructor
A function called at the creation of an object.
The DatabaseConnection constructor establishes a connection to the database.
Shumaila Saeed
Nov 17, 2023
Repeatedly Asked Queries
What is a destructor in programming?
A destructor is a method that is automatically invoked when an object is destroyed.
Shumaila Saeed
Nov 22, 2023
Can constructors have parameters?
Yes, constructors can have parameters to initialize an object with specific values.
Shumaila Saeed
Nov 22, 2023
Do destructors return any value?
No, destructors do not return a value and typically have no parameters.
Shumaila Saeed
Nov 22, 2023
Are destructors necessary in garbage-collected languages?
In garbage-collected languages like Java, destructors are less critical but still useful for resource cleanup.
Shumaila Saeed
Nov 22, 2023
What happens if a constructor is not defined?
If not defined, most languages provide a default constructor that initializes the object.
Shumaila Saeed
Nov 22, 2023
Can a class have multiple constructors?
Yes, a class can have multiple constructors, known as constructor overloading.
Shumaila Saeed
Nov 22, 2023
What is a copy constructor?
A copy constructor initializes an object using another object of the same class.
Shumaila Saeed
Nov 22, 2023
What is a constructor in programming?
A constructor is a special method used to initialize a new instance of a class.
Shumaila Saeed
Nov 22, 2023
Why are constructors important in OOP?
Constructors ensure that objects start in a valid and initialized state.
Shumaila Saeed
Nov 22, 2023
Is it possible to explicitly call a destructor?
In some languages like C++, you can explicitly call a destructor, but it's generally not recommended.
Shumaila Saeed
Nov 22, 2023
Can constructors and destructors be inherited?
Constructors and destructors are not inherited but can be called from derived class constructors/destructors.
Shumaila Saeed
Nov 22, 2023
Why are destructors important in C++?
Destructors are vital in C++ for managing dynamic memory and resource deallocation.
Shumaila Saeed
Nov 22, 2023
What is the role of destructors in resource management?
Destructors play a crucial role in freeing resources and preventing memory leaks.
Shumaila Saeed
Nov 22, 2023
How do constructors differ from normal methods?
Constructors have the same name as the class and do not have a return type.
Shumaila Saeed
Nov 22, 2023
What is constructor overloading?
Constructor overloading is creating multiple constructors with different parameters.
Shumaila Saeed
Nov 22, 2023
Do all OOP languages support destructors?
Most OOP languages support destructors, but their implementation may vary.
Shumaila Saeed
Nov 22, 2023
How are constructors and destructors declared in Java?
In Java, constructors are declared like methods but with no return type; destructors are handled by the garbage collector.
Shumaila Saeed
Nov 22, 2023
How do default constructors work?
Default constructors initialize objects without requiring any external data.
Shumaila Saeed
Nov 22, 2023
Can destructors throw exceptions?
Throwing exceptions from destructors is generally discouraged and can be problematic.
Shumaila Saeed
Nov 22, 2023
When is a destructor called in C++?
In C++, a destructor is called when an object goes out of scope or is deleted.
Shumaila Saeed
Nov 22, 2023
Share this page
Link for your blog / website
HTML
Link to share via messenger
About Author
Written by
Shumaila SaeedShumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.
Shumaila Saeed
Dua Fatima
Hifza Nasir
