Question

Create an abstract class called GeometricFigure. Each figure includes a height, a width. a figure type, and an area. Include an abstract method to determine the area of the figure. Create two subclasses called Square and Triangle. Create an application that demonstrates creating objects of both subclasses, and store them in an array.

Answer 1

abstract class GeometricFigure {

    protected double height;
    protected double width;
    protected String type;
    protected double area;

    public GeometricFigure(double height, double width, String type) {
        this.height = height;
        this.width = width;
        this.type = type;
    }

    public abstract double getArea();

    @Override
    public String toString() {
        return "height=" + height + ", width=" + width + ", type='" + type + '\'' + ", area=" + getArea();
    }
}

class Square extends GeometricFigure {

    public Square(double height, double width) {
        super(height, width, "Square");
    }

    @Override
    public double getArea() {
        area = height * width;
        return area;
    }
}

class Triangle extends GeometricFigure {

    public Triangle(double height, double base) {
        super(height, base, "Triangle");
    }

    @Override
    public double getArea() {
        area = 0.5 * height * width;
        return area;
    }
}

class GeometricFigureTest {

    public static void main(String[] args) {
        GeometricFigure[] figures = {new Triangle(3, 10), new Square(4, 9), new Triangle(5, 5)};
        for (int i = 0; i < figures.length; i++) {
            System.out.println(figures[i]);
        }
    }
}