Example of abstract class

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/*WAP that create abstract class figure. Declare area method in this class. class Rectangle and Circle inherits  class Figure.Write the method in all class that prints the area of respective Figure.*/



 abstract class Ab
   {
   abstract   void area();
}
class Rectangle extends Ab
   {
        int l,b;
     void  area()
   {
      System.out.println("rectengle is="+(l*b));
   }
 }
class circule extends Ab
   {
        int r;
     void  area()
   {
      System.out.println("circule is="+(3.14*r*r));
   }
 }   
class Abdemo
{
public static void main()
  {
     Ab  s1 =new Rectangle();
    Ab  s2 =new circule();
         s1.area();
        s2.area();
}
     
}      

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