import java.util.Scanner;
interface Cloneable{
    Object clone();
}
public class Circle implements Cloneable{
    public double R;//半径
      Circle(){}
      Circle(double a)
      {
          R=a;
      }
     
    public Circle clone(){  
        Circle obj=null;   
         try{
               obj=(Circle)super.clone();
             }
         catch(CloneNotSupportedException e)
         {  
             System.out.println("异常");
         }
        return obj;
    }
    public static void main(String [] args)
    {
        while(true)
        {
            System.out.println("请输入数！");
            double j;
            Scanner sc=new Scanner(System.in);
            j=sc.nextDouble();         
            Circle c=new Circle(j);
            Circle c1=(Circle)c.clone();
            System.out.println(" "+c1.equals(c));
            System.out.println(" "+c1.R);
        }
        
    }

}

什么异常

，在进行深复制的时候，是不是复制函数有问题？