小编Jam*_*ell的帖子

这是我的代码

public class Workshop3
{
    public static void main (String [] args)
    {
        System.out.println ("please enter radius of circle");
        double radius;
        Scanner keyboard = new Scanner (System.in);
        keyboard.nextDouble (radius);
    }
}

我收到的错误是

找不到符号级扫描仪

在线上

Scanner keyboard = new Scanner (System.in);