//6.8췽ĵ˳1Ĺܡ
class Point
{
    private double xCoordinate;
    private double yCoordinate;
    public Point(){}
    public Point(double x,double y)
    {
      xCoordinate=x;
      yCoordinate=y;
    }
    public String toString()
    {
     return "("+Double.toString(xCoordinate)+""+Double.toString(yCoordinate)+")";
    }
     //滹
}
public class Ball
{
   private Point center;         //ĵ
   private double radius;        //뾶
   private String colour;        //ɫ
   public Ball(){}
   public Ball(double x,double y,double r)//ĵ㼰뾶Ĺ췽
   {
     center=new Point( x,y);              //PointĹ췽
     radius=r;
   }
   public Ball(double x,double y,double r,String c)//ĵ㡢뾶ɫķ
   {
     this(x,y,r);                      //Ball(doublb x,double y,double r)
     colour=c;
   }
   public String toString()
    {
     return"һ"+center.toString()+"뾶"+Double.toString(radius)+"ɫΪ"+colour;
    }
}
