Error with a class customiser for charts

I want to customise my charts so I want to use a class customiser, I have used the following code to change the categorie label to vertical , but I don't know why it generate an error!

the code:

 public void customize(JFreeChart jfc, JRChart jrc) {
  CategoryPlot myPlot = jfc.getCategoryPlot();
  HorizontalCategoryAxis axis = (HorizontalCategoryAxis)myPlot.getDomainAxis();
  axis.setVerticalCategoryLabels(true);
 } 

the error is:

 cannot find symbol : Class HorizontalCategoryAxis

Also I have tried:

    CategoryItemRenderer renderer = (CategoryItemRenderer) plot.getRenderer();
    CategoryItemLabelGenerator generator = new   StandardCategoryItemLabelGenerator("{2}", new DecimalFormat("0.00"));
    renderer.setLabelGenerator(generator);
    renderer.setItemLabelsVisible(true);
    XYItemRenderer renderer2 = (XYItemRenderer) plot.getRenderer();
    XYItemLabelGenerator generator2 = new StandardXYItemLabelGenerator("{2}", new  DecimalFormat("0.00"));
    renderer.setLabelGenerator(generator);

and the errors:

cannot find symbol appear for the line 开发者_C百科:

renderer.setLabelGenerator(generator);

and

no suitable constructor for

XYItemLabelGenerator generator2 

my reference is:

http://files.blogjava.net/hao446tian/jfreechart-1.0.1-US_developer_guide.pdf

UPDATE Still I can't see the categorieExpression( on the Y axis) :(((

---

First of all your failed code seems to be version mismatch between your examples and the library you use. The setLabelGenerator method has been removed and replaced with setBaseItemLabelGenerator:

CategoryPlot plot = yourPlot;
CategoryItemRenderer renderer = (CategoryItemRenderer) plot.getRenderer();
CategoryItemLabelGenerator generator = new   StandardCategoryItemLabelGenerator("{2}", new DecimalFormat("0.00"));
renderer.setBaseItemLabelGenerator(generator);
renderer.setBaseItemLabelsVisible(true);
XYItemRenderer renderer2 = (XYItemRenderer) plot.getRenderer();
XYItemLabelGenerator generator2 = new StandardXYItemLabelGenerator("{2}", 
        new  DecimalFormat("0.00"),
        new  DecimalFormat("0.00"));
renderer.setBaseItemLabelGenerator(generator);

You can see in my example that the StandardXYItemLabelGenerator takes two formats, one for the x values and one for y.

As for the use of HorizontalCategoryAxis it suffered the same fate as setLabelGenerator. Assuming you want a vertical plot with a CategoryAxis that has labels that are vertical, not horizontal, you can use setLabelAngle to achieve the desired effect:

public void customize(JFreeChart jfc, JRChart jrc) {
    CategoryPlot myPlot = jfc.getCategoryPlot();
    CategoryAxis axis = myPlot.getDomainAxis();
    axis.setLabelAngle(-Math.PI / 2);
}