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About Byron Kiourtzoglou

Byron Kiourtzoglou
Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Reverse String with StringTokenizer

With this example we are going to demonstrate how to reverse a String with a StringTokenizer. The StringTokenizer is used to break a String into tokens. In short, to reverse a String with a StringTokenizer you should:

  • Get a new StringTokenizer for a specified String, using the StringTokenizer(String str) constructor.
  • Create a new empty String, that will be the reversed String.
  • Invoke hasMoreTokens() and nextToken() API methods of StringTokenizer to get the tokens of this String and add each one of them to the beggining of the reversed String, using a space character between them. After taking all the tokens of the Strings, the reversed String will contain all the tokens of the initial one, in the reversed order.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.util.StringTokenizer;

public class ReverseStringWithStringTokenizer {
	
	public static void main(String[] args) {
		
		String s = "Java Code Geeks - Java Examples";
		 
		StringTokenizer st = new StringTokenizer(s);
		 
		String sReversed = "";
		 
		while (st.hasMoreTokens()) {
			sReversed = st.nextToken() + " " + sReversed;
		}
		
		System.out.println("Original string is : " + s);
		System.out.println("Reversed string is : " + sReversed);
		
	}

}

Output:

Original string is : Java Code Geeks - Java Examples
Reversed string is : Examples Java - Geeks Code Java

 
This was an example of how to reverse a String with a StringTokenizer in Java.

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