public abstract class Shape {
public abstract double getArea();
public void printArea(){
System.out.println("The area is: " + getArea());
} }
// A subclass of shape for rectangles class Rectangle extends Shape { private double width; private double height;
public Rectangle(double w, double h){ width = w; height = h; }
public double getArea(){ return width * height; } }
// A subclass of shape for circles class Circle extends Shape { private double radius;
public Circle(double r) { radius = r; }
public double getArea() { return 3.14 * radius * radius; } }
// A subclass of shape for triangles class Triangle extends Shape { private double base; private double height;
public Triangle(double b, double h){ base = b; height = h; }
public double getArea(){ return (base * height)/2; }
}
public class Main { public static void main(String[] args) {
// Create an array of shapes
Shape[] shapes = new Shape[3];
// Fill the array shapes with different shape objects
shapes[0] = new Rectangle(10, 4);
shapes[1] = new Circle(7);
shapes[2] = new Triangle(3, 7);
for (Shape shape : shapes) {
shape.printArea();
} } }