Question

Define an abstract class GeometricShape with a color (string), filled (boolean), and dateCreated (java.util.Date)

1. GeometricShape has getter/setter methods for each attribute, along with a getArea, a getPerimeter, and toString method that returns the shape information in a formatted string including class name, color, filled, dimensions (if available), area, perimeter, and date created
2. Additionally GeometricShape implements the Java Comparable interface and defines a static method max used to find the larger of two GeometricShapes based on their area

Answer 1

abstract class GeometricShape implements Comparable<GeometricShape> {
    private String color = "white";
    private boolean filled;
    private java.util.Date dateCreated;

    protected GeometricShape() {
        dateCreated = new java.util.Date();
    }

    protected GeometricShape(String color, boolean filled) {
        dateCreated = new java.util.Date();
        this.color = color;
        this.filled = filled;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public boolean isFilled() {
        return filled;
    }

    public void setFilled(boolean filled) {
        this.filled = filled;
    }

    public java.util.Date getDateCreated() {
        return dateCreated;
    }

    public String toString() {
        return "created on " + dateCreated + "\ncolor: " + color +
                " and filled: " + filled;
    }

    @Override
    public int compareTo(GeometricShape o) {
        return Double.compare(getArea(), o.getArea());
    }

    public static GeometricShape max(GeometricShape obj1, GeometricShape obj2) {
        if (obj1.compareTo(obj2) > 0) {
            return obj1;
        } else {
            return obj2;
        }
    }

    /**
     * Abstract method getSurfaceArea
     */
    public abstract double getArea();

    /**
     * Abstract method getPerimeter
     */
    public abstract double getPerimeter();
}

class TestGeometricObject {

    public static void main(String[] args) {
        GeometricShape obj1 = new GeometricShape() {
            @Override
            public double getArea() {
                return 10;
            }

            @Override
            public double getPerimeter() {
                return 5;
            }
        };

        GeometricShape obj2 = new GeometricShape() {
            @Override
            public double getArea() {
                return 7;
            }

            @Override
            public double getPerimeter() {
                return 3;
            }
        };

        GeometricShape max = GeometricShape.max(obj1, obj2);
        System.out.println("Max getArea is " + max.getArea());
    }
}