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Thus, this explains the main difference between default and parameterized constructor. Conversely, the parameterized constructor is a constructor that the programmer creates with one or more parameters to initialize the instance variables of a class. The default constructor is a constructor that the compiler automatically generates in the absence of any programmer-defined constructors. Difference Between Default and Parameterized Constructor Definition Finally, the results print on the console. There is an object of Calculation in the main method. It will return the summation of those two numbers. It takes two arguments x and y and assigns those values to the instance variables num1 and num2.įurthermore, there is a method called sum. In line 7, there is a parameterized constructor. It has two instance variables called num1 and num2. It initializes all the member variables to zero or null.įigure 2: Program with Parameterized ConstructorĪbove is a class called Calculation. If the programmer does not define a constructor, the program calls the default constructor automatically. Moreover, it helps to give initial values to the instance variables in the class. It also allocates memory for that object. The constructor is called when an object is created. – Comparison of Key Differences Key TermsĬonstructor, Default Constructor, OOP, Parameterized Constructor What is the Difference Between Default and Parameterized Constructor

The constructor can either be default or parameterized. It is a special method that allows initializing an object on its creation. These objects communicate with each other in the program. In OOP, everything is a class, which helps to build objects. Most high-level programming languages support Object Oriented Programming ( OOP). That is the main difference between default and parameterized constructor. In contrast, the parameterized constructor is a type of constructor defined by the programmer by passing parameters to give initial values to the instance variables in the class. The default constructor is a type of constructor that is called automatically when the programmer has not defined any constructor in the program.