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Level up your SDET and QA skills! 🚀 What is the difference between Constructor and a Method?

SDET Automation Testing Interview Questions & Answers

We will be covering a wide range of topics including QA manual testing, automation testing, Selenium, Java, Jenkins, Cucumber, Maven, and various testing frameworks.

In Java, both constructors and methods are used to define behavior, but there are some differences between them.

Purpose: The main purpose of a constructor is to initialize the object's state when an instance of a class is created, whereas a method is used to define behavior or actions that an object can perform.

Name: A constructor has the same name as the class in which it is defined, whereas a method can have any valid name.

Return type: A constructor doesn't have a return type, not even void, whereas a method must have a return type or void.

Parameters: A constructor may or may not have parameters, whereas a method can have zero or more parameters.

Access modifiers: A constructor can have access modifiers such as public, private, or protected, whereas a method can have any access modifier.

Inheritance: Constructors are not inherited by subclasses, but methods can be inherited by subclasses.

Default constructor: If a class doesn't have any constructor, a default constructor is provided by Java, whereas methods don't have a default implementation.

In summary, constructors are used to initialize an object's state when it is created, whereas methods define the behavior of an object. Constructors have the same name as the class and don't have a return type, while methods can have any name and must have a return type or void. Constructors may or may not have parameters, and they can have access modifiers. Methods can have any access modifier, and they can be inherited by subclasses.