Java | Reverse a String without using String class function

package com.java.tricks;

import java.lang.reflect.Field;

public class ReverseString {

     /**

      * This method is used to reverse string without using any string class method.

      */

     private static void reverseString(String value) {

           try {

               

                /** to access the private value[] array of String class. */

                Field field = String.class.getDeclaredField("value");

                /** Grant the access to access the field value. */

                field.setAccessible(true);

                /** Access the value array from the String class. */

                char[] array = (char[]) field.get(value);

                int i = 0; int j = array.length-1;

                /** Reverse the array values to reverse it. */

                while(i<j) {

                     char temp = array[i];

                     array[i] = array[j];

                     array[j] = temp;

                     i++; j--;

                }

               

                /** Set the reversed array into the String Object. */

                field.set(value, array);

           } catch (NoSuchFieldException | SecurityException |

                     IllegalArgumentException | IllegalAccessException e) {

                System.err.println(e.getCause());

           }

     }

     /**

      * Driver method to reverse a String.

      */

     public static void main(String[] args) {

           String value = "geeksforgeeks";

           System.out.println(value);

           reverseString(value);

           System.out.println(value);

     }

}