Circle.java

public class Circle
{
    public static final double RADIUS_DEFAULT = 1.0;
    public static final String COLOR_DEFAULT = "red";

    private double radius;
    private String color;

    public Circle() {
        radius = RADIUS_DEFAULT;
        color = COLOR_DEFAULT;
    }

    public Circle(double radius) {
        this.radius = radius;
        color = COLOR_DEFAULT;
    }

    public Circle(double radius, String color) {
        this.radius = radius;
        this.color = color;
    }

    public double getRadius() {
        return radius;
    }

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

    public String getColor() {
        return color;
    }

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

    public String toString() {
        return "Circle with radius = " + radius + "and color of" + color;
    }

    public double getArea() {
        return radius*radius*Math.PI;
    }
}