What is Constructor? Last Updated : 23 Oct, 2024 Summarize Comments Improve Suggest changes Share Like Article Like Report A constructor is a special type of method used in object-oriented programming languages to initialize objects. The constructor is called automatically every time when an object is created, allowing the object to set initial values for its attributes or perform other setup tasks.In this article, we will learn about constructor, its variant and their use cases in C++, Python and Java.Table of ContentWhat is a Constructor?Syntax of Constructor in PythonSyntax of Constructor in JavaSyntax of Constructor in C++Types of ConstructorsApplication of ConstructorsConclusionWhat is Constructor? - FAQsWhat is a Constructor?In programming, particularly in languages like Java, C++, Python, and others, a constructor is used to allocate memory and initialize the state of a new object. Constructors have the same name as the class and do not have a return type, not even `void`.Syntax of Constructor in PythonBelow is the syntax of constructor in Python: Python class ClassName: def __init__(self): # initialization code pass Syntax of Constructor in JavaBelow is the syntax of constructor in Java: Java class ClassName { // Constructor ClassName() { // initialization code } } Syntax of Constructor in C++Below is the syntax of constructor in C++: C++ class ClassName { public: // Constructor ClassName() { // initialization code } }; Types of ConstructorsTypes of constructors are nothing but the overloaded versions of the constructor that allows the creation and initialization of objects in different ways. The types of constructors are language specific:Types of Constructors in PythonDefault ConstructorParameterized ConstructorTypes of Constructors in JavaDefault ConstructorParameterized ConstructorCopy ConstructorTypes of Constructors in C++Default ConstructorParameterized ConstructorCopy ConstructorMove ConstructorApplications of ConstructorsFollowing are the major applications of constructors:Constructors are mainly used to initialize the attributes of an object when it is created.Constructors can set default values for attributes. This ensures that the newly created objects are in a valid state.Different constructor types allow us to create objects in different ways.Constructor allows user to manage the object resource allocation.ConclusionConstructor is one of the basic and important aspects of object-oriented programming which are used to define how objects should be created and initialized. They make a guarantee that the newly created object is in a valid state. Comment More infoAdvertise with us A atul122g7ki Follow Improve Article Tags : C++ Practice Tags : CPP Similar Reads C++ Programming Language C++ is a computer programming language developed by Bjarne Stroustrup as an extension of the C language. It is known for is fast speed, low level memory management and is often taught as first programming language. It provides:Hands-on application of different programming concepts.Similar syntax to 5 min read Non-linear Components In electrical circuits, Non-linear Components are electronic devices that need an external power source to operate actively. Non-Linear Components are those that are changed with respect to the voltage and current. Elements that do not follow ohm's law are called Non-linear Components. Non-linear Co 11 min read Spring Boot Tutorial Spring Boot is a Java framework that makes it easier to create and run Java applications. It simplifies the configuration and setup process, allowing developers to focus more on writing code for their applications. This Spring Boot Tutorial is a comprehensive guide that covers both basic and advance 10 min read Object Oriented Programming in C++ Object Oriented Programming - As the name suggests uses objects in programming. Object-oriented programming aims to implement real-world entities like inheritance, hiding, polymorphism, etc. in programming. The main aim of OOP is to bind together the data and the functions that operate on them so th 5 min read Class Diagram | Unified Modeling Language (UML) A UML class diagram is a visual tool that represents the structure of a system by showing its classes, attributes, methods, and the relationships between them. It helps everyone involved in a projectâlike developers and designersâunderstand how the system is organized and how its components interact 12 min read 3-Phase Inverter An inverter is a fundamental electrical device designed primarily for the conversion of direct current into alternating current . This versatile device , also known as a variable frequency drive , plays a vital role in a wide range of applications , including variable frequency drives and high power 13 min read Backpropagation in Neural Network Back Propagation is also known as "Backward Propagation of Errors" is a method used to train neural network . Its goal is to reduce the difference between the modelâs predicted output and the actual output by adjusting the weights and biases in the network.It works iteratively to adjust weights and 9 min read 30 OOPs Interview Questions and Answers [2025 Updated] Object-oriented programming, or OOPs, is a programming paradigm that implements the concept of objects in the program. It aims to provide an easier solution to real-world problems by implementing real-world entities such as inheritance, abstraction, polymorphism, etc. in programming. OOPs concept is 15 min read What is Vacuum Circuit Breaker? A vacuum circuit breaker is a type of breaker that utilizes a vacuum as the medium to extinguish electrical arcs. Within this circuit breaker, there is a vacuum interrupter that houses the stationary and mobile contacts in a permanently sealed enclosure. When the contacts are separated in a high vac 13 min read Polymorphism in Java Polymorphism in Java is one of the core concepts in object-oriented programming (OOP) that allows objects to behave differently based on their specific class type. The word polymorphism means having many forms, and it comes from the Greek words poly (many) and morph (forms), this means one entity ca 7 min read Like