String valueOf vs concatenation with empty string
<p>I am working in Java code optimization. THE PROBLEM IS I'm unclear about the difference between String.valueOf or the +"" sign. 
    I'd explain my problem as:</p>

<pre><code>int intVar = 1;
String strVar = intVar+"";
String strVar = String.valueOf(i);
</code></pre>

<p>What is the difference between line 2 and 3?</p>
