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.

    public class Student
{
    int roll;
    String className;
    Student()
    {
        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();
    }
}