Use a StreamTokenizer object to parse a string separated by commas

 Use a StreamTokenizer object to parse a string entered from the keyboard containing a series of data items separated by commas and output each of the items on a separate line.

 If you don't make '\n' a whitespace character, a comma will be necessary at the end of the last token. End-of-line terminates the input so only a single line is processed.

Here is some sample input and output:

red , "red and yellow", red and yellow, 123, 123.456, 1.2E10
  red
"red and yellow"
red and yellow
123
123.456
1.2E10

As you see, this tokenizer setup processes anything as tokens.

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import java.io.StreamTokenizer; import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.IOException;   public class ParseString {   public static void main(String[] args) {     char separator = ',';     StreamTokenizer tokenizer = new StreamTokenizer(new InputStreamReader(System.in));     tokenizer.resetSyntax();       // Characters other than comma and special characters are word characters     tokenizer.wordChars('\u0000', (char)(separator - 1));                 // Everything is a word character     tokenizer.wordChars((char)(separator + 1), '\u00ff');                 // except for the separator     tokenizer.whitespaceChars('\n', '\n');                                // Make end-of-line whitespace(and therefore a word delimiter)     tokenizer.whitespaceChars(separator, separator);                      // Delimiter separates words     tokenizer.eolIsSignificant(true);                                     // End-of-line to be reported as TT_EOL       int type = 0;                                                         // Stores the value returned by nextToken()     String token = null;                                                  // Will store the tokens that we find     try {       while((type = tokenizer.nextToken()) != StreamTokenizer.TT_EOL) {   // As long as we don't have EOL         if(type == StreamTokenizer.TT_WORD) {                             // Check for a word           System.out.println("  "  + tokenizer.sval.trim());              // and output it         } else {           assert false;                                                   // We only expect words         }       }     } catch(IOException e) {       e.printStackTrace();       System.exit(1);     }   } }

Output of Above Java Program
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