Subclass shapes get area and print it. Rectangle, Circle, and Triangle.

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();
}
}
}