PROGRAM TO FIND AREA OF DIFFERENT SHAPES USING OVERRIDING

[project topics]

Code:

import java.io.*;
class Figure
{
double x,y;
        Figure(double l, double m)
       {  
               x=l;
               y=m;
       }
}
class Rectangle extends Figure
{
Rectangle(double l, double m)
{
            super(l,m);
}
        double area()
       {
               return(x*y);
       }
}
class Circle extends Figure
{
final float pi=3.14f;
        Circle(double l,double m)
        {
                 super(l,m);
      }
      double area()
      {
               return(pi*x);
      }
}
class Triangle extends Figure
{
Triangle(double d1,double d2)
       {
                super(d1,d2);
}
       double area()
      {
             return((x*y)/2);
      }
}
class Over
{
public static void main(String args[]) throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        Figure f;
        System.out.println("enter the length and breadth");
Rectangle r=new Rectangle(Integer.parseInt(br.readLine()), Integer.parseInt(br.readLine()));  
        f=r;
        System.out.println("the area of the rectangle is"+r.area());
        System.out.println("enter the radius" );
    Circle  ci=new Circle(Integer.parseInt(br.readLine()),Integer.parseInt(br.readLine()));
         f=ci;
        System.out.println("The area of circle is"+ci.area());
        System.out.println("Enter the breadth and height");
    Triangle t=new Triangle(Integer.parseInt(br.readLine()),Integer.parseInt(br.readLine()));
         f=t;
         System.out.println("the area of triangle is "+t.area());
}
}

OUTPUT
E:\111msc\java>java Over
enter the length and breadth
2
3
the area of the rectangle is6.0
enter the radius
2
1
The area of circle is6.28000020980835
Enter the breadth and height
3
4
the area of triangle is 6.0