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Java.io.StreamTokenizer.commentChar() Method
Description
The java.io.StreamTokenizer.commentChar(int ch) method specifies that the character argument starts a single-line comment. All characters from the comment character to the end of the line are ignored by this stream tokenizer. Any other attribute settings for the specified character are cleared.
Declaration
Following is the declaration for java.io.StreamTokenizer.commentChar() method.
public void commentChar(int ch)
Parameters
ch − The character.
Return Value
This method does not return a value.
Exception
NA
Example
The following example shows the usage of java.io.StreamTokenizer.commentChar() method.
package com.tutorialspoint; import java.io.*; public class StreamTokenizerDemo { public static void main(String[] args) { String text = "Hello. This is a text 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 character "a" as a commentChar st.commentChar('a'); // 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 −
< encountered. Word: Hello. Word: This Word: is End of File encountered.
java_io_streamtokenizer.htm
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