Circle

package ex2;

/**
* Circle class
*
* @author Hi.Im.darkness
*/
public class Circle extends Shape {
    /**
    * This is a constant variable of class
    * This is value of PI in mathimetic
    */
    private static final double PI = 3.14;

    /**
    * Radius of circle
    */
    private double radius;

    /**
    * Default Constructor
    */
    public Circle() {
        setRadius(1.0);
    }

    /**
    * Contructor arguments
    *
    * @param _radius  double type
    */
    public Circle(double _radius) {
        setRadius(_radius);
    }

    /**
    * Constructor arguments
    *
    * @param _color    String type
    * @param _filled   boolean type
    * @param _radius   double type
    */
    public Circle(double _radius, String _color, boolean _filled) {
        super(_color, _filled);
        setRadius(_radius);
    }

    /**
    * Set radius of circle
    *
    * @param _radius   double type
    */
    public void setRadius(double _radius) {
        radius = _radius;
    }

    /**
    * Get radius of Circle
    *
    * @return double type
    */
    public double getRadius() {
        return radius;
    }

    /**
    * Compute and return area of Circle
    *
    * @return double type
    */
    public double getArea() {
        return PI * radius * radius;
    }

    /**
    * Compute and return perimeter of Circle
    *
    * @return double type
    */
    public double getPerimeter() {
        return PI * 2 * radius;
    }

    /**
    * {@inheritDoc}
    *
    * @return addition infomation about radius, area and perimeter of object
    */
    @Override
    public String toString() {
        String shapeStr = super.toString();
        String radiusStr = String.format("%-10s:%10s%n", "Radius", radius);
        String areaStr = String.format("%-10s:%10s%n", "Area", getArea());
        String perimeterStr = String.format("%-10s:%10s%n", "Perimeter", getPerimeter());
        return shapeStr + radiusStr + areaStr + perimeterStr;
    }

    public static void main(String[] args) {
        System.out.println(new Circle());
        System.out.println(new Circle(2));
        System.out.println(new Circle(2, "black", true));
    }

}