Alpha numeric string to corresponding key strokes
<p>I was working on a problem where I need to convert a given alpha-numeric <code>String</code> to text based format (don't know what exactly to call it). <code>Example: a = 2, c = 222, f = 333</code> etc. To make it more clear, this is found on your phone's keypad. Like the way you text in the old hard key phones which didn't have QWERTY keyboard.</p>

<p><code>Example: (INPUT) hello 
(OUTPUT) 44+33+555+555+666</code></p>

<p>Here is what I had in mind. I can pre-load all the cases (26 + 10 over all) into a <code>HashMap</code> and use that. But I think there should be some other better way to do this right? All/any brilliant ideas are welcome.</p>
