Java.io.StreamTokenizer.whitespaceChars() Method

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Description

The java.io.StreamTokenizer.whitespaceChars(int low, int hi) method specifies that all characters c in the range low <= c <= high are white space characters. White space characters serve only to separate tokens in the input stream. Any other attribute settings for the characters in the specified range are cleared.

Declaration

Following is the declaration for java.io.StreamTokenizer.whitespaceChars() method.

public void whitespaceChars(int low, int hi)

Parameters

• low − The low end of the range.

• high − The high end of the range.

Return Value

This method does not return a value.

Exception

NA

Example

The following example shows the usage of java.io.StreamTokenizer.whitespaceChars() method.

package com.tutorialspoint;

import java.io.*;

public class StreamTokenizerDemo {
   public static void main(String[] args) {
      String text = "Hello. This is a text \n that will be split "
         + "into tokens. 1 + 1 = 2";
         
      try {
         // create a new file with an ObjectOutputStream
         FileOutputStream out = new FileOutputStream("test.txt");
         ObjectOutputStream oout = new ObjectOutputStream(out);

         // write something in the file
         oout.writeUTF(text);
         oout.flush();

         // create an ObjectInputStream for the file we created before
         ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt"));

         // create a new tokenizer
         Reader r = new BufferedReader(new InputStreamReader(ois));
         StreamTokenizer st = new StreamTokenizer(r);

         // set letters o- t as white space chars
         st.whitespaceChars('o', 't');

         // print the stream tokens
         boolean eof = false;
         
         do {
            int token = st.nextToken();

            switch (token) {
               case StreamTokenizer.TT_EOF:
                  System.out.println("End of File encountered.");
                  eof = true;
                  break;
                  
               case StreamTokenizer.TT_EOL:
                  System.out.println("End of Line encountered.");
                  break;
                  
               case StreamTokenizer.TT_WORD:
                  System.out.println("Word: " + st.sval);
                  break;
                  
               case StreamTokenizer.TT_NUMBER:
                  System.out.println("Number: " + st.nval);
                  break;
                  
               default:
                  System.out.println((char) token + " encountered.");
                  
                  if (token == '!') {
                     eof = true;
                  }
            }
         } while (!eof);

      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Word: AHell
Number: 0.0
Word: Thi
Word: i
Word: a
Word: ex
Word: ha
Word: will
Word: be
Word: li
Word: in
Word: ken
Number: 0.0
Number: 1.0
+ encountered.
Number: 1.0
= encountered.
Number: 2.0
End of File encountered.