title: How to customize a tooltip of CategoryPlot items in JFreeChart?
body: <p>I need to change the format of the default tooltip in the bars drawn in the plot of a chart.</p>
  
  <p>I don't know if my direction of looking at the problem is right. I am looking at the default format for the class <code>StandardCategoryToolTipGenerator</code> that is  </p>
  
  <pre><code>DEFAULT_TOOL_TIP_FORMAT_STRING = "({0}, {1}) = {2}"
  </code></pre>
  
  <p>How can I redefine this value?</p>
  
  <p>Thanks in advance.</p>