coding help

[accies76]

hi, just started using java but got stuck so thought i'd look on google for help! hope this is the right place to post this.

this is my code

public static void main(String[] args) {

   Scanner scan = new Scanner(System.in);

 
   String testString;
   int len = testString.length();

   
   System.out.println("Enter info ");
   testString = scan.next();
   
   System.out.println("The length of the string is: " + len);

I want the user to enter a word(s) and my program to be able to read that and output how many numbers are in that word. I can do it but entering a word into the program code myself but i cant do it using scanner.

I'm not sure how to go about it, have tried a few things myself but none work.

I know that is the problem area.

String testString;
int len = testString.length();

thanks

[emceenugget]

testString isn't initialized yet, therefore it cannot have a length, giving you an error. Switch your "int len ... " to be after you set testString.

[accies76]

thanks for the reply.

i did initialize it as "null" initially but that gave the error "run:
Exception in thread "main" java.lang.NullPointerException" in regards to "int len...".

so thats what I don't know, what to initialize teststring as.

[xcallmejudasx]

put testString = scan.next(); before you initiliaze len. len is trying to find the length of testString before it has been given a length.

[accies76]

ah ok, thanks.

[biswarup_java]

you cannot invoke a method on a null object. thts why it threw tht nullpointerexception when u initialized 'testString' wid null n thn on the next line tried to invoke the 'length();' method in the line :
int len = testString.length();