下面程序是从命令窗口界面输入圆半径，然后计算球圆面积与周长。把划线部分填上语句，将程序补充完整。

  import java.io.*;

  public class Qiumianji

  {

         public static void main (String args[ ])

           {

                    int a = 0;

                    double b,c;

                    Sting s;

                    try{

                          BufferedReader br =new BufferedReader (new InputStreamReader (___【1】__))；

                          s = br.readLine();

                          a = __【2】__;

                    }

                    catch(IOExcepion e)

                    {}

                    b = 3.14*a*a;

                    c = 2*3.14*a;

                    System.out.println(”该圆面积为”+b+””+”周长为”+c);

               }

}