StringTokenizer class in Java with example | Set 1 ( Constructors)

2.1

StringTokenizer class in Java is used to break a string into tokens.

Example:
stringtokenizer

A StringTokenizer object internally maintains a current position within the string to be tokenized. Some operations advance this current position past the characters processed.
A token is returned by taking a substring of the string that was used to create the StringTokenizer object.

Constructors:

StringTokenizer(String str) :
str is string to be tokenized.
Considers default delimiters like new line, space, tab, 
carriage return and form feed.

StringTokenizer(String str, String delim) :
delim is set of delimiters that are used to tokenize
the given string.

StringTokenizer(String str, String delim, boolean flag):
The first two parameters have same meaning.  The flag 
serves following purpose.

If the flag is false, delimiter characters serve to 
separate tokens. For example, if string is "hello geeks"
and delimiter is " ", then tokens are "hello" and "geeks".

If the flag is true, delimiter characters are 
considered to be tokens. For example, if string is "hello
 geeks" and delimiter is " ", then tokens are "hello", " " 
and "geeks".
/* A Java program to illustrate working of StringTokenizer
   class:*/
import java.util.*;
public class NewClass
{
    public static void main(String args[])
    {
        System.out.println("Using Constructor 1 - ");
        StringTokenizer st1 =
             new StringTokenizer("Hello Geeks How are you", " ");
        while (st1.hasMoreTokens())
            System.out.println(st1.nextToken());

        System.out.println("Using Constructor 2 - ");
        StringTokenizer st2 = 
             new StringTokenizer("JAVA : Code : String", " :");
        while (st2.hasMoreTokens())
            System.out.println(st2.nextToken());

        System.out.println("Using Constructor 3 - ");
        StringTokenizer st3 = 
             new StringTokenizer("JAVA : Code : String", " :",  true);
        while (st3.hasMoreTokens())
            System.out.println(st3.nextToken());
    }
}

Output :

Using Constructor 1 - 
Hello
Geeks
How
are
you
Using Constructor 2 - 
JAVA
Code
String
Using Constructor 3 - 
JAVA
 
:
 
Code
 
:
 
String

We will soon be discussing methods of StringTokenizer in separate posts.

Reference:
https://docs.oracle.com/javase/7/docs/api/java/util/StringTokenizer.html

This article is contributed by Mohit Gupta. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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