22) Define an Interface Shape with abstract method area(). Write a java program to calculate an area of Circle and Sphere.(use final keyword) .
import java.util.*;
interface Shape
{
void area();
}
class Circle implements Shape
{
final float PI=3.14f;
float ac,r;
Scanner s=new Scanner(System.in);
void accept()
{
System.out.println("Enter the Radius ");
r=s.nextFloat();
}
public void area()
{
ac=PI*r*r;
}
public void show()
{
System.out.println("Area of circle is :"+ac);
}
}
class Sphere implements Shape
{
final float PI=3.14f;
float as,r;
Scanner s=new Scanner(System.in);
void accept()
{
System.out.println("Enter the Radius ");
r=s.nextFloat();
}
public void area()
{
as=4*PI*r*r;
}
public void show()
{
System.out.println("Area of Sphere is :"+as);
}
}
class Slip22
{
public static void main(String args[])
{
Circle s1=new Circle();
Sphere s2=new Sphere();
s1.accept();
s1.area();
s2.accept();
s2.area();
s1.show();
s2.show();
}
}
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