Palidrome.java

import java.util.Random;
import java.util.Scanner;

public class App {
  public static void main(String[] args) throws Exception {
    String[] exampleText = "momdad".split("");

    System.out.println(rebuildString(exampleText));

    reverseText(exampleText, 0);

    System.out.println(rebuildString(exampleText));
  }

  public static String rebuildString(String... oldStrings) {
    String s = "";

    for (String f : oldStrings) {
      s += f;
    }

    return s;
  }

  public static void reverseText(String[] text, int currentIndex) {
    int fullLength = text.length - 1;
    int endIndex = fullLength - currentIndex;

    if (endIndex - currentIndex > 0) {
      String e = text[endIndex];
      String f = text[currentIndex];

      text[endIndex] = f;
      text[currentIndex] = e;

      reverseText(text, currentIndex + 1);
    }
  }
}