It’s a special type of method used to initialize the object immediately upon its creation. It does that by creating an object in memory and returning a reference to it. The purpose of a constructor is to create an instance of a class. Methods, on the other hand, refer to the set of code that can be called at any point in a program through the method’s name to perform some task and return the result. It has the same name as the class in which it resides. Constructors are special types of method in Java used to initialize objects of its class. Difference between Constructor and Method Definition of Constructor and MethodĪ constructor in similar to an instance method in Java with the exception of a return type. Constructors in Java are classified into two types – Default Constructors and Parameterized Constructors. In short, constructors are special method functions used to initialize the objects of its class. Unlike methods, constructors have no return type. It is used to initialize an object immediately after its creation and it has the same name as the class in which it resides. Like methods, constructors also contain a set of instructions that are executed each time an object is created. Constructors are often referred to as special types of method in Java. Because of the frequent initialization, Java allows for automatic initialization through the use of a constructor, which is called when an instance of an object is created. All variables in a class must be initialized every time an instance is created, which can be tedious at times. In this example, x and y are parameters, and the method addNumbers finds the addition between x and y and returns the result with the variable z.Ī constructor is similar to a method except it does not have a return type. Here, the method name is “addNumbers” and when it is called, the code is executed and the variable z is returned by the method. Methods are great time savers that allow for repetition of certain sections of code without actually retyping the code. When a method is called at any point within a program, the program is executed and when its purpose is done, the execution returns to the part of the program from where it was called. Each method is referred to by its own name. In simple terms, a method is nothing but a set of instructions and when it is called, the set of instructions within the method is executed. If the method is unable to return the value, its return type must be void. This article explains the difference between the two.Ī method is nothing but a collective set of code which is addresses by name and can be called at any point to perform some specific task and return the result. A constructor is quite similar to a method except it’s called when an instance of an object is created. It’s more like a subprogram that acts on data and returns a value. Methods are a set of code that determines how a class’ data can be used. The variables that are defined within a class are called instance variables. Java classes consist of variables and methods. Classes and objects are the basic concepts of object-oriented programming. Any concept that is to be implemented in a Java program must be encapsulated within a class. You can say class is the basic building block of an object-oriented language such as Java. It’s an extensible program-code template which defines the shape and nature of an object.
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