Reverse Of a String

Metod-1

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Reverse os string without using reverse function

import java.util.*;
 
class ReverseString
{
   public static void main(String args[])
   {
      String original, reverse = "";
      Scanner in = new Scanner(System.in);
 
      System.out.println("Enter a string to reverse");
      original = in.nextLine();
 
      int length = original.length();
 
      for ( int i = length - 1 ; i >= 0 ; i-- )
         reverse = reverse + original.charAt(i);
 
      System.out.println("Reverse of entered string is: "+reverse);
   }
}

Method-2

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Reverse Of a string using reverse function in String BuilderClass

class InvertString
{
   public static void main(String args[])
   {
      StringBuffer a = new StringBuffer("Java programming is fun");
      System.out.println(a.reverse());
   }
}

Method-3

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Reverse Of a String Using Char Array

public static String reverse(String str) {

        StringBuilder strBuilder = new StringBuilder();

        char[] strChars = str.toCharArray();




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

            strBuilder.append(strChars[i]);

        }




        return strBuilder.toString();

    }

Method-4

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private static string ReverseWithCharArray(string source)
{
    char[] inputstream = source.ToCharArray();
    for (int i = 0, j = inputstream.Length - 1; i < j; i++, j--)
    {
        inputstream[j] = source[i];
        inputstream[i] = source[j];
    }
    return new string(inputstream);
}