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Java.io.StreamTokenizer.nextToken() Method
Description
The java.io.StreamTokenizer.nextToken() method parses the next token from the input stream of this tokenizer. The type of the next token is returned in the ttype field. Additional information about the token may be in the nval field or the sval field of this tokenizer. Typical clients of this class first set up the syntax tables and then sit in a loop calling nextToken to parse successive tokens until TT_EOF is returned.
Declaration
Following is the declaration for java.io.StreamTokenizer.nextToken() method.
public int nextToken()
Parameters
NA
Return Value
This method returns the value of the ttype field.
Exception
IOException − If an I/O error occurs.
Example
The following example shows the usage of java.io.StreamTokenizer.nextToken() 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); // 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: Hello. Word: This Word: is Word: a Word: text Word: that Word: will Word: be Word: split Word: into Word: tokens. Number: 1.0 + encountered. Number: 1.0 = encountered. Number: 2.0 End of File encountered.