/**
 * SphereUtil
 *
 * This class caluclates a sphere's volume and surface area.
 * Since I don't specify "public class" the class is considered to have
 * package access. Package access means that only other classes in the
 * same package as this class can use this class.
 * Public access means that anyone can access the class. 
 * Other access modifiers are: protected, and private.
 *
 * @author Brad Rippe
 */

class SphereUtil {

  /**
   * This method calucates the volume of sphere
	* the modifier "static" states that this method belongs to all instances of the 
	* class, not just on instance.
	*/
  public static double volume (double r) {
    return 4.0/3 * Math.PI * Math.pow(r, 3);
  }

  public double surArea (double r) {
    return 4 * Math.PI * Math.pow(r, 2);
  }

} // finish class SphereUtil