debugging - Basic Java questions Scanning -

this basic java i'm struggling n00b style. prints out this

please enter '.' when want calculate 1 2 3 . numbers 1 2 3 sum is0the product is1

when supposed calculate sum , product of consecutive numbers. wrong id appreciate help!

main method

    import java.util.*;      public class numberscanned {          public static void main(string[] args) {                  system.out.println("please enter '.' when want calculate");             scanner keyboard = new scanner(system.in);                  string scannedstring = keyboard.nextline();                 scanning scanz= new scanning(scannedstring);         while(!keyboard.nextline().equals("."))      {          scanz.set(scannedstring);      }          keyboard.close();          system.out.println("numbers are"+scannedstring);         scanz.printstate();         }     }  class scanning   public class scanning {      int num;       int sum;       int product;       string userinput;             public scanning(string userinput)             {                  num=0;                  sum=0;                   product=1;             this.userinput=userinput;             }       public void set(string userinput)       {       for(int index=0; index<userinput.length(); index++)             {                  if(character.isdigit(userinput.charat(index))==true)                 {                  num=userinput.charat(index);                   sum+=num;                 product*=num;                     }                 else                 {                       index++;                 }                }         }        public void printstate()       {          system.out.println("the sum is"+sum+"the product is"+product);        }  } 

a few things at:

• we know keyboard.nextline() gets input console, checking it's validity (more importantly, when check it?). looking @ input or last line?
• isdigit return true if passed in character number. want operate on numbers or characters in for loop?
  • (a side note, happens if enter "1 10" in console?)
• a for loop automatically increment index @ end of loop, additional ++ unnecessary