Reverse a string in java

public class ReverseString {

      public static void main(String[] args) {

            String word = "Hai this is karthik";

            word = new StringBuffer(word).reverse().toString();

            System.out.println(word);

      }

}

Output:

             kihtrak si siht iaH

import java.util.*;

class ReverseString

{

   public static void main(String args[])

   {

      String reverse ="";

      System.out.println("Enter the String");

      Scanner scan = new Scanner(System.in);

      String  original = scan.nextLine();

      int length = original.length();

      for ( int i = length - 1 ; i >= 0 ; i-- )

         reverse = reverse + original.charAt(i);

      System.out.println("Reverse string is: "+reverse);

   }

}

Output:

Enter the String

hai this is karthik

Reverse string is: kihtrak si siht iah

Using StringTokenizer word by word 

   import java.util.StringTokenizer;

public class ReverseLine {

      public static void main(String[] args) {

            String word = "Java Reverse String";

            StringTokenizer st = new StringTokenizer(word, " ");

            String stringReversedLine = "";

            while (st.hasMoreTokens()) {

                  stringReversedLine = st.nextToken() + " " + stringReversedLine;

            }

            System.out.println("Reversed string by word :" + stringReversedLine);

      }

}

Output:

                   Reversed string is : String Reverse Java