Exp 10

***INTERFACE****

*public class interfaceusingreturntype {

                public static void main(String[] args) {

                                // TODO Auto-generated method stub

                                circle obj1=new circle();

                                float i= obj1.calculate(10,0);

                                System.out.println("Area of circle="+i);

                               

                                rectangle obj2=new rectangle();

                                System.out.println("Area= "+obj2.calculate(10,20));

                }

}

interface area

{

                float PI=3.14f;

                float calculate(int x,int y);

}

class circle implements area

{

                public float calculate(int x,int y)

                {

                                return(PI*x*x);

                }

}

class rectangle implements area

{

                public float calculate(int x,int y)

                {

                                return(x*y);

                }

}

***OUTPUT***

Area of circle=314.0

Area= 200.0