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Java StreamTokenizer eolIsSignificant() Method with Example

StreamTokenizer Class eolIsSignificant() method: Here, we are going to learn about the eolIsSignificant() method of StreamTokenizer Class with its syntax and example.
Submitted by Preeti Jain, on April 21, 2020

StreamTokenizer Class eolIsSignificant() method

• eolIsSignificant() method is available in java.io package.
• eolIsSignificant() method is used to identifies whether the end of the line is considered as tokens or not. When the boolean variable is set to true if indicates the end of the line is considered as tokens and nextToken() returns TT_EOL and set the type field to this value if an end of the line is read when the boolean is set to false, it indicates the end of the line is considered as whitespace and distribute only to separate tokens.
• eolIsSignificant() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• eolIsSignificant() method does not throw an exception at the time of checking end-of-line is significant.

Syntax:

    Public void eolIsSignificant(boolean status);

Parameter(s):

• boolean status – This parameter is set to true, when it identifies that End-Of-Line characters are separate tokens otherwise it identifies that End-Of-Line characters are whitespace.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void eolIsSignificant(boolean status) method of
// StreamTokenizer

import java.io.*;

public class EolIsSignificant {
    public static void main(String[] args) {
        String str = "Hi, This is a mathematical expression : \n" +
            " 2 * 4 = 8" + "8 + 5 = 13";

        try {
            // Instantiates FileOutputStream  and ObjectOutputStream 
            FileOutputStream fos_stm = new FileOutputStream("D:\\includehelp.txt");
            ObjectOutputStream obj_out_stm = new ObjectOutputStream(fos_stm);

            // By using writeUTF() method is to
            // write the given string in the file
            obj_out_stm.writeUTF(str);
            obj_out_stm.flush();

            // Instantiates FileOutputStream  and ObjectOutputStream 
            ObjectInputStream obj_in_stm = new ObjectInputStream(new FileInputStream("D:\\includehelp.txt"));

            // Instantiates StreamTokenizer and Reader
            Reader reader = new BufferedReader(new InputStreamReader(obj_in_stm));
            StreamTokenizer st = new StreamTokenizer(reader);

            // By using eolIsSignificant() method is to
            // set the end of line treats as whitespace
            // i.e "\n"considers as whitespace instead of
            // End of Line found
            st.eolIsSignificant(false);

            // Here, we are considering initially 
            // file is not empty
            boolean end_of_file = false;

            while (!end_of_file) {
                int token = st.nextToken();

                switch (token) {
                    case StreamTokenizer.TT_EOF:
                        System.out.println("End of File Found");
                        end_of_file = true;
                        break;

                    case StreamTokenizer.TT_EOL:
                        System.out.println("End of Line Found");
                        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 + " Found.");
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

Output

= Found.
word: Hi
, Found.
word: This
word: is
word: a
word: mathematical
word: expression
: Found.
number: 2.0
* Found.
number: 4.0
= Found.
number: 88.0
+ Found.
number: 5.0
= Found.
number: 13.0
End of File Found