Constructor Example 1

class marks

{

        private int mark1,mark2,total;

        marks() {} 

        marks(int m1,int m2)

        {

                mark1 = m1;

                mark2 = m2;

        }

        marks(marks m1)

        {

                mark1 = m1.mark1;

                mark2 = m1.mark2;

        }

        void calc()

        {

                total = mark1 + mark2;

        }

        void putdetails()

        {

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

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

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

        }

        public static void main(String args[])

        {

                marks m1 = new marks(90,80);

                marks m2 = new marks(m1);

                marks m3 = new marks();

                m1.calc();

                m2.calc();

                m1.putdetails();

                m2.putdetails();

                m3.putdetails();

        }

}