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    <p>You should really consider using a <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Map.html" rel="nofollow"><code>Map</code></a> to store character/encoding pairs. Oh, and to create these random pairs you can add your characters to a <code>List</code> and make use of <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Collections.html#shuffle%28java.util.List%29" rel="nofollow"><code>Collections.shuffle</code></a> instead of reinventing the wheel yourself.</p> <hr> <p>Let me demonstrate using only <code>Lalpha</code> (only lowercase letters). You want something along these lines:</p> <pre><code>List&lt;Character&gt; l = new ArrayList&lt;Character&gt;(Lalpha.length); for (char c : Lalpha) l.add(c); Collections.shuffle(l); Map&lt;Character, Character&gt; encoding = new HashMap&lt;Character, Character&gt;(Lalpha.length); Map&lt;Character, Character&gt; decoding = new HashMap&lt;Character, Character&gt;(Lalpha.length); for (int i = 0 ; i &lt; Lalpha.length ; i++) { encoding.put(Lalpha[i], l.get(i)); decoding.put(l.get(i), Lalpha[i]); } </code></pre> <p>Now lets say we wanted to encode / decode the string <code>helloworld</code>, we would do this:</p> <pre><code>String s = "helloworld"; // Encode: String enc = ""; for (char c : s.toCharArray()) enc += encoding.get(c); System.out.println(enc); // Decode: String dec = ""; for (char c : enc.toCharArray()) dec += decoding.get(c); System.out.println(dec); </code></pre> <p>Output (one of many possible):</p> <blockquote> <p>vjwwmtmcwz<br> helloworld</p> </blockquote> <p>Of course, you can incorporate uppercase letters and what-not using the same idea.</p>
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