Number base conversion
<p>I'd like to convert integers from decimal base to quaternal base. What is the more concise way to do it ?</p>

<pre><code>// From 4-base to decimal
int d = Integer.parseInt("10", 4); // 5

// From decimal to decimal string 
String b10 = String.valueOf(d);    // "5"

// From decimal to 4-base string ?
String b4 = yourMagicFunction(d, 4);  // "10"
</code></pre>
