JFreeChart Class

This class includes one of the most important classes in the JFreeChart library and is itself called "JFreeChart".
JFreeChart class provides a representation of a Java 2D chart. Methods present in the class enable developers to control various aspects of a generated chart and to create an Abstract Window Toolkit (AWT) BufferedImage representing the chart.
Several simple types of charts can be created using JFreeChart class directly.
This class comes under the org.jfree.chart package.
JFreeChart method is used to create bar charts, line charts, pie charts, and xy plots including time series data.

Constructor	Description
JfreeChart(Plot plot)	It creates a new chart based on the supplied plot.
JfreeChart(String title, Font titleFont, Plot plot, boolean createLegend)	It creates a new chart with the given title and plot.
JfreeChart(String title, Plot plot)	It creates a new chart with the given title and plot.

Method	Description
addChangeListener(ChartChangeListener listener)	This method registers an object for notification of changes to the chart.
addLegend(LegendTitle legend)	This method adds a legend to the plot and sends a ChartChangeEvent to all registered listeners.
addSubtitle(Title subtitle)	This method adds a chart subtitle, and notifies registered listeners that the chart has been modified.
clearSubtitles( )	This method clears all subtitles from the chart and sends a ChartChangeEvent to all registered listeners.
createBufferedImage(int width, int height)	This method creates and returns a buffered image into which the chart has been drawn.
draw(Graphics2D g2, Rectangle2D area)	This method draws the chart on a Java 2D graphics device (Such as the screen or a printer).
getBackgroundImage( )	This method returns the background image for the chart, or null if there is no image.
getCategoryPlot( )	This method returns the plot cast as a CategoryPlot.
getID( )	This method returns the ID for the chart.
getLegend( )	This method returns the legend for the chart, if there is one.
getPlot( )	This method returns the plot for the chart.
getSubtitle(int index)	This method returns a chart subtitle.
getTitle( )	This method returns the main chart title.
getXYPlot( )	This method returns the plot cast as a XYPlot.
removeLegend( )	This method removes the first legend in the chart and sends a ChartChangeEvent to all registered listeners.