import javax . swing . JOptionPane

Public class Example {

       public static void main (string [ ] args )    {

          String response ;

          response. = JOptionPane .showinput Dia log

   Radius. = Interger .parseInt ( response)

2* radius*3.14159;

     //3.   Calculator the diameter 

   //4.  Calculator the area 

    //5.   Display all the results.