title: Java logging framework - with printf() support
body: <p>In c, <code>printf()</code> is really easy to use, and in Java <code>System.out.printf()</code> is also amazing, but in <code>log4j</code>, seems only can use <code>"First name: "+ firstName +", Age: " + age</code>, which is very uncomfortable.</p>
  
  <p><strong>The questions are:</strong></p>
  
  <ul>
  <li>What is the difficulty that prevents <code>log4j</code> from implement such a feature?</li>
  <li>What logging framework support such feature, can u give a short example that include the maven dependencies &amp; Java code.</li>
  </ul>