public class A
{
  public static void main(String[] args)
  {
    B c1 = new B(5);
    System.out.println("c1: "+c1);
    B c2 = (B)c1.clone();
    System.out.println("c2: "+c2);
   }
}


class B implements Cloneable
{
  double radius;

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

  public Object clone()
  {
    try
    {
      return super.clone();
    }
    catch (CloneNotSupportedException ex)
    {
      return null;
    }
  }

  public String toString()
  {
    return "radius "+radius;
  }
}