How do I rotate tick mark labels on the domain of a number axis in JFreeChart?

Question

Just like is being done in the following example, I want the tick mark labels on the domain of chart to be rotated 45 degrees as the are in this chart: http://left.subtree.o

Answer 1

The first answer given is for a numeric domain axis. If you have a category axis, you want this code:

CategoryAxis domainAxis = plot.getDomainAxis();  
domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);