Answer to Question #123903 in Java | JSP | JSF for Shouzab

Question

Design an abstract class GeometricObject with lineColor as data member. GeometricObject must ensure that its children implement calcArea() method. Design Rectangle and Circle classes as children of GeometricObject class with overridden toString() method to return “ Rectangle with ‘w’ width and ‘h’ height is drawn” OR “Circle with ‘r’ radius is drawn”.
- The attribute of Rectangle are length and width
- The attribute of Circle is radius

*Hint:
Area of Circle= πr2
Area of Rectangle=w*l

Answer 1

public static abstract class GeometricObject
{
    private String lineColor;
    public abstract double calcArea();

    public void setLineColor(String lineColor)
    {
        this.lineColor = lineColor;
    }
    public String getLineColor()
    {
        return lineColor;
    }
    public abstract String toString();
}

public static class Rectangle extends GeometricObject
{
    private double height;
    private double width;

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        this.width = width;
    }


    @Override
    public double calcArea() {
        return width* height;
    }

    @Override
    public String toString() {
        return String.format( "Rectangle with %f width and %f height is drawn",width, height);
    }
}

public static class Circle extends GeometricObject
{
    private double radius;

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }


    @Override
    public double calcArea() {
        return Math.PI* Math.pow(radius,2);
    }

    @Override
    public String toString() {
        return String.format("Circle with %f radius is drawn",radius);
    }
}