lab_Task.java

abstract class Shape {
 abstract double area();
 void display() {
 System.out.println("This is a shape");
 }
}

class Circle extends Shape {
 double radius;
 Circle(double radius) {
 this.radius = radius;
 }
 double area() {
 return Math.PI * radius * radius;
 }
}
class Rectangle extends Shape {
 double length, width;
 Rectangle(double length, double width) {
 this.length = length;
 this.width = width;
 }
 double area() {
 return length * width;
 }
}
public class lab_Task{
 public static void main(String[] args) {
 Shape s1 = new Circle(5); 
 Shape s2 = new Rectangle(4, 6); 
 s1.display();
 System.out.println("Circle Area: " + s1.area());
 s2.display();
 System.out.println("Rectangle Area: " + s2.area());
 }
}