Circle.java

package com.company;

/**
 * Created by addicted on 27.02.16.
 */
public class Circle {
    private double radius;

    public double getCircumference() {
        return 2 * Math.PI * radius;
    }

    public void setCircumference(double circumference) {
        this.radius = circumference / (2 * Math.PI) ;
    }

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

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) throws IllegalArgumentException {
        if (radius < 0) {
            throw new IllegalArgumentException("Radius can't be negative");
        }
        this.radius = radius;
    }

    public double getArea() {
        double area = Math.PI * Math.pow(radius, 2);
        return area;
    }

    public void setArea(double area) throws IllegalArgumentException {
        if (area < 0) {
            throw new IllegalArgumentException("Area can't be negative");
        }
        radius = Math.sqrt(area / Math.PI);
    }

    public void print() {
        System.out.println("I'm a circle");
    }
}