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    <p>Here is my response to this - The main issue I saw with your code is you creating Strings as temporary objects in multiple areas of the code - This makes it very inefficient as well as very slow. The other issue is that you want to externalize all you can from the loops. I have compiled it and run it and it works.</p> <pre><code>package com.rch.test; public class Transposer { public static String transpose(String s) { int length = s.length(); int end = length - 1; StringBuilder t = new StringBuilder(); for (int i = 0; i &lt; length / 2; i++) { t.append(s.charAt(i)); t.append(s.charAt(end)); end--; } // Length of String is odd if (length % 2 == 1) { // add character in middle of String to the end of the new String t.append(s.charAt(length / 2)); } return t.toString(); } public static String unTranspose(String s) { int length = s.length(); StringBuilder t = new StringBuilder(); if (length % 2 == 1) { for (int i = 0; i &lt; length; i += 2) { t.append(s.charAt(i)); } for (int i = length - 2; i &gt; 0; i -= 2) { t.append(s.charAt(i)); } } else if (length % 2 == 0) { for (int i = 0; i &lt; length - 1; i += 2) { t.append(s.charAt(i)); } for (int i = length - 1; i &gt; 0; i -= 2) { t.append(s.charAt(i)); } } return t.toString(); } public static void main(String[] args) { String testString = "bridge"; String transposedString = Transposer.transpose(testString); String finalString = Transposer.unTranspose(transposedString); System.out.println("1)" + testString); System.out.println("2)" + transposedString); System.out.println("3)" + finalString); } } </code></pre> <p>Output : 1)bridge 2)bergid 3)bridge</p>
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    1. POTransposing and Untransposing a String in java
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    1. USRomain Hippeau
    1. USRomain Hippeau
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