Sphere.java

public class Sphere extends Matter {
	
	int radius = 1;
	double mass = 1;

	public Sphere(int radius) {
		this.radius = radius;
	}

	public double getMass() {
		return mass;
	}

	public void setMass(double mass) {
		this.mass = mass;
	}

	public double getVolume() {
		return Math.PI * radius * radius * radius / 3;
	}

}