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Thread: Streamtokenzier help

  1. #1
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    Default Streamtokenzier help

    Im trying to apply the streamtokenzier on this string ex: 10+5 however it only recognizes 10 and 5 as numbers but it doesn't recognize the + as word does anybody know why? I will using it later to parse mathematical equations

    tokenizer.eolIsSignificant(true);
     
    ......
     
    try
    {
      while (tokenizer.nextToken() != StreamTokenizer.TT_EOF)
     {
     
         if (tokenizer.ttype == StreamTokenizer.TT_NUMBER)
        {
     
            System.out.println("number is :" tokenizer.nval "\n");
         }
     
        else if (tokenizer.ttype == StreamTokenizer.TT_WORD){
     
               System.out.println("word is :" tokenizer.sval + "\n");
        }
      }
     
    } catch (IOException ex) {
    ex.printStackTrace();
    }
    Output in netbeans 6.8:

    number is :10.0

    number is :5.0
    Last edited by helloworld922; January 24th, 2010 at 03:20 PM.

  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Streamtokenzier help

    I believe this is because by default StreamTokenizer only allows word which have characters that are letters. You can change them by using the wordChars() method. If you are going to do something like parsing in an expression, though, I would strongly recommend using regular expressions.