Constructor Example

import java.io.*;

class students

{

        private int sno;

        private String sname;

        private int mark1,mark2,total;

        students() throws Exception

        {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            System.out.print("Enter Student No : ");

            sno = Integer.parseInt(br.readLine());

            System.out.print("Enter Student Name : ");

            sname = br.readLine();

            System.out.print("Enter mark1 and mark2 : ");

            mark1 = Integer.parseInt(br.readLine());

            mark2 = Integer.parseInt(br.readLine());

         }

        students(int no,String name,int m1,int m2)

        {

                sno = no;

                sname = name;

                mark1 = m1;

                mark2 = m2;

                total = mark1 + mark2;

        }

        void putstud()

        {

                System.out.println("Sno : " + sno);

                System.out.println("Sname : " + sname);

                System.out.println("Mark1 : " + mark1);

                System.out.println("Mark2 : " + mark2);

                System.out.println("Total  : " + total);

       }

        public static void main(String args[]) throws Exception

        {

                students s1 = new students();

                students s2 = new students(100,"Kirthika",90,80);

                s1.putstud();

                s2.putstud();

        }

}