Difference Between
versus

Constructor vs. Destructor: Know the Difference

Shumaila Saeed
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.
Constructor vs. Destructor

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
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
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
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
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
Shumaila Saeed
Nov 22, 2023
ADVERTISEMENT

Comparison Chart

Purpose

Initializes a new object.
Cleans up and releases resources of an object.
Shumaila Saeed
Shumaila Saeed
Nov 22, 2023

Timing

Called when an object is created.
Called when an object is destroyed.
Shumaila Saeed
Shumaila Saeed
Nov 22, 2023

Overloading

Can be overloaded with different parameters.
Cannot be overloaded.
Shumaila Saeed
Shumaila Saeed
Nov 22, 2023

Resource Management

Allocates and initializes resources.
Deallocates and cleans up resources.
Shumaila Saeed
Shumaila Saeed
Nov 22, 2023

Automatic Call

Automatically called at object creation.
Automatically called at object destruction.
Shumaila Saeed
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
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
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
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
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
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
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
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
Shumaila Saeed
Nov 17, 2023

Constructor

To form by assembling or combining parts; build.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Destructor

Special block of code for cleaning up resources.
The NetworkConnection destructor terminates the connection upon object destruction.
Shumaila Saeed
Shumaila Saeed
Nov 17, 2023

Constructor

To create (an argument or a sentence, for example) by systematically arranging ideas or terms.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Destructor

An incinerator for refuse.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Constructor

(Mathematics) To draw (a geometric figure) that meets specific requirements.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Destructor

An explosive, usually remote-controlled device for effecting a destruct.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Constructor

Something formed or constructed from parts.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Destructor

One who destructs.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Constructor

A concept, model, or schematic idea
A theoretical construct of the atom.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Destructor

A furnace or oven for the burning or carbonizing of refuse.
Shumaila Saeed
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
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
Shumaila Saeed
Oct 19, 2023

Constructor

A person who, or thing that, constructs.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Destructor

A destroyer.
Fire, the destructor and the artificial death of things.
Shumaila Saeed
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
Shumaila Saeed
Oct 19, 2023

Destructor

A furnace or oven for the burning or carbonizing of refuse
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Constructor

(object-oriented programming) A class method that creates and initializes each instance of an object.
Shumaila Saeed
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
Shumaila Saeed
Oct 19, 2023

Constructor

A constructer.
Shumaila Saeed
Shumaila Saeed
Oct 19, 2023

Constructor

Someone who contracts for and supervises construction (as of a building)
Shumaila Saeed
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
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
Shumaila Saeed
Nov 22, 2023

Can constructors have parameters?

Yes, constructors can have parameters to initialize an object with specific values.
Shumaila Saeed
Shumaila Saeed
Nov 22, 2023

Do destructors return any value?

No, destructors do not return a value and typically have no parameters.
Shumaila Saeed
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
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
Shumaila Saeed
Nov 22, 2023

Can a class have multiple constructors?

Yes, a class can have multiple constructors, known as constructor overloading.
Shumaila Saeed
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
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
Shumaila Saeed
Nov 22, 2023

Why are constructors important in OOP?

Constructors ensure that objects start in a valid and initialized state.
Shumaila Saeed
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
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
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
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
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
Shumaila Saeed
Nov 22, 2023

What is constructor overloading?

Constructor overloading is creating multiple constructors with different parameters.
Shumaila Saeed
Shumaila Saeed
Nov 22, 2023

Do all OOP languages support destructors?

Most OOP languages support destructors, but their implementation may vary.
Shumaila Saeed
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
Shumaila Saeed
Nov 22, 2023

How do default constructors work?

Default constructors initialize objects without requiring any external data.
Shumaila Saeed
Shumaila Saeed
Nov 22, 2023

Can destructors throw exceptions?

Throwing exceptions from destructors is generally discouraged and can be problematic.
Shumaila Saeed
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
Shumaila Saeed
Nov 22, 2023

Share this page

Link for your blog / website
HTML
Link to share via messenger
About Author
Shumaila Saeed
Written by
Shumaila Saeed
Shumaila 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.

Popular Comparisons

Trending Comparisons

Poster vs. InfographicPoster vs. Infographic
Shumaila SaeedShumaila Saeed
December 25, 2023
A Poster is a large printed image or notice for public display, while an Infographic is a visual representation of information or data.
FPTP vs. PRFPTP vs. PR
Shumaila SaeedShumaila Saeed
February 16, 2024
FPTP (First Past the Post) is a simple plurality voting system where the candidate with most votes wins; PR (Proportional Representation) allocates seats based on the proportion of votes each party receives.
Japanese Eyes vs. Chinese EyesJapanese Eyes vs. Chinese Eyes
Shumaila SaeedShumaila Saeed
December 25, 2023
Japanese Eyes and Chinese Eyes refer to linguistic structures in Japanese and Chinese respectively, each reflecting unique aspects of grammar and syntax.
2 Pole Motors vs. 4 Pole Motors2 Pole Motors vs. 4 Pole Motors
Shumaila SaeedShumaila Saeed
December 25, 2023
2 Pole Motors have one pair of magnetic poles and run at higher speeds, while 4 Pole Motors have two pairs of poles and operate at lower speeds, offering higher torque.
Poem vs. PoetryPoem vs. Poetry
Shumaila SaeedShumaila Saeed
December 25, 2023
A poem is a piece of writing that expresses ideas and emotions with a distinctive style and rhythm; poetry is the art form of writing such pieces.
Nuclear Family vs. Joint FamilyNuclear Family vs. Joint Family
Shumaila SaeedShumaila Saeed
January 9, 2024
Nuclear Family is a family unit consisting of parents and their children. Joint Family is a larger family structure comprising parents, children, and other relatives living together.
Login vs. LogonLogin vs. Logon
Shumaila SaeedShumaila Saeed
December 25, 2023
"Login" and "Logon" are often used interchangeably to describe the process of gaining access to a computer system, but "login" can also refer to the credentials used for access.
NM3 vs. M3NM3 vs. M3
Hifza NasirHifza Nasir
April 19, 2024
NM3 measures gas volume under Normal conditions (0°C and 1.01325 bar), while M3 measures volume under the conditions at which it is measured, without standard adjustment.
Pulley vs. SheavePulley vs. Sheave
Hifza NasirHifza Nasir
April 4, 2024
A pulley is a wheel on an axle designed to support movement and change of direction of a taut cable, while a sheave is the wheel part of a pulley system that specifically interacts with the cable.
Pycharm Community vs. Pycharm ProPycharm Community vs. Pycharm Pro
Shumaila SaeedShumaila Saeed
February 4, 2024
PyCharm Community is a free, open-source IDE for Python development, while PyCharm Pro is a paid version with additional advanced features like web development support and database tools.
Gorilla Glass 3 vs. Gorilla Glass 5Gorilla Glass 3 vs. Gorilla Glass 5
Shumaila SaeedShumaila Saeed
January 1, 2024
Gorilla Glass 3 offers improved scratch resistance and durability compared to its predecessors, while Gorilla Glass 5 focuses on enhanced drop protection and toughness.
Data Roaming vs. Cellular DataData Roaming vs. Cellular Data
Shumaila SaeedShumaila Saeed
December 25, 2023
Data Roaming allows usage of mobile network services outside of the home network area, while Cellular Data is using mobile services within the home network.
Catapult vs. TrebuchetCatapult vs. Trebuchet
Shumaila SaeedShumaila Saeed
January 4, 2024
A catapult is a ballistic device using tension or torsion to launch projectiles, while a trebuchet is a type of catapult using a counterweight for greater force and distance.
Slazenger Logo vs. Puma LogoSlazenger Logo vs. Puma Logo
Shumaila SaeedShumaila Saeed
February 15, 2024
The Slazenger logo features a panther, symbolizing agility and tradition, while the Puma logo depicts a leaping puma, representing speed and strength.
Traditional Trade vs. Modern TradeTraditional Trade vs. Modern Trade
Shumaila SaeedShumaila Saeed
December 25, 2023
Traditional trade involves local, small-scale, often personalized commerce; modern trade is characterized by large-scale, technology-driven, and impersonal retail environments.
Crane vs. HeronCrane vs. Heron
Shumaila SaeedShumaila Saeed
June 24, 2024
Cranes are large, long-legged and long-necked birds known for their elaborate dances, while herons are typically more solitary, stealth hunters with a distinctive S-shaped neck.
NDM vs. FTPNDM vs. FTP
Shumaila SaeedShumaila Saeed
February 15, 2024
NDM (Network Data Mover) automates and secures data transfers across networks, while FTP (File Transfer Protocol) is a standard network protocol for transferring files between computers.
Pebble vs. StonePebble vs. Stone
Dua FatimaDua Fatima
May 30, 2024
A pebble is a small, smooth rock worn by water or weather, typically found on beaches or rivers, while a stone is a larger, more varied rock that can be rough or smooth, used in construction or as a tool.
5'11" vs. 6'0"5’11” vs. 6’0″
Shumaila SaeedShumaila Saeed
February 4, 2024
The difference between 5'11" and 6'0" is one inch, with 5'11" being 71 inches and 6'0" being 72 inches tall.
Contact Force vs. Field ForceContact Force vs. Field Force
Shumaila SaeedShumaila Saeed
December 25, 2023
Contact Force is a force applied through physical contact, while Field Force acts over a distance without physical contact.
Seed vs. GrainSeed vs. Grain
Shumaila SaeedShumaila Saeed
January 24, 2024
A seed is a plant's reproductive unit capable of developing into another plant, while a grain is a type of seed harvested from cereal plants, often used for food.
House of Representatives vs. SenateHouse of Representatives vs. Senate
Shumaila SaeedShumaila Saeed
December 25, 2023
The House of Representatives, based on population, drafts tax legislation and impeachment charges, while the Senate, with equal representation per state, tries impeachments and ratifies treaties.
Ammonium Sulfate vs. UreaAmmonium Sulfate vs. Urea
Shumaila SaeedShumaila Saeed
December 25, 2023
Ammonium Sulfate is an inorganic salt used as a fertilizer, while Urea is an organic compound used in agriculture and industry.
PPM vs. PPMVPPM vs. PPMV
Shumaila SaeedShumaila Saeed
February 10, 2024
PPM (parts per million) measures the concentration of one substance within a million parts of another. PPMV (parts per million by volume) expresses gas concentration as volume per million volumes of air.

Featured Comparisons

New Comparisons