Calculate the area of triangle and rectangle by using abstract class. - Code

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Sunday, October 30, 2011

Calculate the area of triangle and rectangle by using abstract class.


  1. Calculate the area of triangle and rectangle by using abstract class.


abstract class Figure
{
      double dim1;
      double dim2;
      Figure(double a, double b)
      {
                  dim1 = a;
                  dim2 = b;
      }
      abstract double area();
}

class Rectangle extends Figure
{
      Rectangle(double a, double b)
      {
                  super(a, b);
      }
      double area()
      {
                  System.out.println("Inside Area for Rectangle.");
                  return dim1 * dim2;
      }
}

class Triangle extends Figure
{
      Triangle(double a, double b)
      {
                  super(a, b);
      }
      double area()
      {
                  System.out.println("Inside Area for Triangle.");
                  return dim1 * dim2 / 2;
      }
}

class AbstractAreas
{
      public static void main(String args[])
      {
                  Rectangle r = new Rectangle(9, 5);
                  Triangle t = new Triangle(10, 8);
                  Figure figref;
                  figref = r;
                  System.out.println("Area is " + figref.area());
                  figref = t;
                  System.out.println("Area is " + figref.area());
      }
}

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