Java IO Tutorial - Java StreamTokenizer nval

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Syntax

StreamTokenizer.nval has the following syntax.

public double nval

Example

In the following code shows how to use StreamTokenizer.nval field.

/*w  ww  .j  av  a 2s . com*/

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.StreamTokenizer;

public class Main {

  public static void main(String args[]) {

    try {

      // Create a file reader
      FileReader fr = new FileReader(args[0]);

      // Create a buffered reader
      BufferedReader br = new BufferedReader(fr);

      // Create a stream tokenizer
      StreamTokenizer st = new StreamTokenizer(br);

      // Process tokens
      while (st.nextToken() != StreamTokenizer.TT_EOF) {
        switch (st.ttype) {
        case StreamTokenizer.TT_WORD:
          System.out.println(st.lineno() + ") " + st.sval);
          break;
        case StreamTokenizer.TT_NUMBER:
          System.out.println(st.lineno() + ") " + st.nval);
          break;
        default:
          System.out.println(st.lineno() + ") " + (char) st.ttype);
        }
      }

      // Close file reader
      fr.close();
    } catch (Exception e) {
      System.out.println("Exception: " + e);
    }
  }
}   

The code above generates the following result.

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