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What is Default constructor ?

A constructor which is not take any argument is called zero argument constructor.or also knows as Default constructor. all object of a class with default constructor are initialize to same set of value.in otherword we say that A default constructor is created only when we don't declare any constructor in our code. Then, by default, the compiler automatically creates a default constructor.

Q.) Example of Default constructor .
    public class Student
    int roll;
    String className;
        System.out.println("Body of default constructor");
    public static void main(String arg[]) 
        System.out.println("Object is going to create");
        Student s1 = new Student();
Object is going to create
Body of default constructor