#### Aim:

To write a java program for abstract class to find areas of different shapes

#### Program:

abstract class shape { abstract double area(); } class rectangle extends shape { double l=12.5,b=2.5; double area() { return l*b; } } class triangle extends shape { double b=4.2,h=6.5; double area() { return 0.5*b*h; } } class square extends shape { double s=6.5; double area() { return 4*s; } } class shapedemo { public static void main(String[] args) { rectangle r1=new rectangle(); triangle t1=new triangle(); square s1=new square(); System.out.println("The area of rectangle is: "+r1.area()); System.out.println("The area of triangle is: "+t1.area()); System.out.println("The area of square is: "+s1.area()); } }

#### Output:

The area of rectangle is: 31.25 The area of triangle is: 13.65 The area of square is: 26.0