Passing arguments and returning values.

Passing arguments and returning values.

class circle

{

        private int radius;

        public void setradius(int r)

        {

                radius = r;

        }

        public float calculate()

        {

                return 3.14f * radius * radius;

        }

        public static void main(String args[])

        {

                if (args.length < 1)

                {

                        System.out.println("Invalid Arguments");

                        System.exit(0);

                }

                circle c = new circle();

                c.setradius(Integer.parseInt(args[0]));

                float area = c.calculate();

                System.out.println("Radius : " + args[0]);

                System.out.println("Area : " + area);

        }

}

Passing object as arguments.

class rectangle

{

        private int len,bre;

        public void setrect(int l,int b)

        {

                len = l;

                bre = b;

        }

        public int totlen(rectangle t)

        {

                return len + t.len;

        }

        public int totbre(rectangle t)

        {

                return bre + t.bre;

        }

        rectangle combine(rectangle t)

        {

                rectangle temp = new rectangle();

                temp.len = len + t.len;

                temp.bre = bre + t.bre;

                return temp;

        }

        public void disp()

        {

                System.out.println("Length : " + len + "\t Breadth : " + bre);

        }

        public static void main(String args[])

        {

                rectangle r1 = new rectangle();

                rectangle r2 = new rectangle();

                rectangle r3 = new rectangle();

                r1.setrect(2,3);

                r2.setrect(4,5);

                int tlen = r1.totlen(r2);

                int tbre = r1.totbre(r2);

                r3 = r1.combine(r2);

                System.out.println("Total length : " + tlen);

                System.out.println("Total Breadth : " + tbre);

                r1.disp();

                r2.disp();

                r3.disp();

        }

}

Function overloading

class exam

{

        private int m1,m2,total;

        public void setmarks(int ma1,int ma2)

        {

                m1 = ma1;

                m2 = ma2;     

        }

        public void setmarks()

        {

                m1 = 80;

                m2 = 100;

        }

        void calculate()

        {

                total = m1 + m2;

        }

        void disp()

        {

                System.out.println("Mark1 : " + m1 + "\t Mark2 " + m2 + "\t Total " + total);

        }

        public static void main(String args[])

        {

                exam e1 = new exam();

                exam e2 = new exam();

                e1.setmarks();

                e2.setmarks(70,80);

                e1.calculate();

                e2.calculate();

                e1.disp();

                e2.disp();

        }

}