Question

Answer the following in brief. Give a program code example wherever applicable.

What is the use of a default constructor?

Answer 1

A default constructor is a no-argument constructor that either the programmer defines explicitly or the Java compiler provides automatically when no other constructor is written in the class. 

Key Uses of a Default Constructor:

• Object Creation: It allows the program to instantiate an object of a class using the new keyword without passing any initial values (e.g., new ClassName()).
• Default Initialisation: It assigns predictable, default starting values to all instance variables of the object (such as 0 for numeric types, false for booleans, and null for objects). 
• Parent Class Linkage: It automatically calls the constructor of the parent class (super()), ensuring that the entire object hierarchy initializes properly.