Thread: 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

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.