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//program to demonstrate example of class student with data members (rollno, name, marks, clas) and contains member functions (showdata), class also contains a default constructor which initializes the data members class student { int rollno; String name; int marks; int clas; public student() //a default constructor { rollno=10; name=new String("abcdef"); marks=90; clas=11; } void showdata() { System.out.println("rollno of student is " + rollno); System.out.println("name of student is " + name); System.out.println("marks of student are " + marks); System.out.println("class of student is " + clas); } } public class studentcons { public static void main(String[] args) { student ob=new student(); //object of class student is created and constructor is called which initialises the data members ob.showdata(); } }