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Java StreamTokenizer quoteChar() Method with Example

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

StreamTokenizer Class quoteChar() method

• quoteChar() method is available in java.io package.
• quoteChar() method denotes that matching pairs of this character delimiter, string constants in this StreamTokenizer. When nextToken() method encounters a string constant, ttype field value is set to the string delimiter and the sval field is set to the content of this string.
• When a string quote character is encountered then a string is recognized, made of all characters after, the string quote character up to the next occurrence of that similar string quote char or line exit, EOF. Escape sequences "\n", "\t" is recognized and changed to single characters as the string is parsed.
• quoteChar() 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.
• quoteChar() method does not throw an exception at the time of quote character.

Syntax:

    public void quoteChar(int character);

Parameter(s):

• int character – represents the character.

Return value:

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

Example:

// Java program to demonstrate the example 
// of void quoteChar(int character) method of StreamTokenizer

import java.io.*;

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

        try {
            // Instantiates FileOutputStream  and ObjectOutputStream 
            FileOutputStream fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\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("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt"));

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

            // By using quoteChar() method is to
            // represent the given char '8' as
            // quote char
            st.quoteChar('8');

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

            while (!end_of_file) {
                // By using nextToken() method is to
                // parse the next token from the stream
                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.
8 Found.
+ Found.
number: 5.0
= Found.
number: 13.0
End of File Found