JFreeChart Setting labels for Piechart legend

You can set custom labels for legend of a piechart. If you want custom label you can do it by using “setLegendLabelGenerator” method of PiePlot.

plot.setLegendLabelGenerator(new StandardPieSectionLabelGenerator("{0} ({2})"));

Generator use Java’s MessageFormat class to construct labels.  {0}, {1} in the above example has special meaning.

Key	Descriptions
{0}	Take Section key as a string
{1}	Take section value
{2}	Take section value as a percentage of all values in the data set.

import java.awt.Color;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;

public class Main {
 public static void main(String args[]) {
  /* Create dataset */
  DefaultPieDataset dataset = new DefaultPieDataset();
  dataset.setValue("2004-2005", 58);
  dataset.setValue("2005-2006", 41);
  dataset.setValue("2006-2007", 85.3);
  dataset.setValue("2007-2008", 81);

  /* create chart */
  JFreeChart chart = ChartFactory.createPieChart("Simple Piechart",
    dataset);

  /* Get PiePlot object */
  PiePlot plot = (PiePlot) chart.getPlot();

  /* Set colors to sections */
  plot.setSectionPaint("2004-2005", new Color(255, 0, 0));
  plot.setSectionPaint("2005-2006", new Color(0, 255, 0));
  plot.setSectionPaint("2006-2007", new Color(0, 0, 255));
  plot.setSectionPaint("2007-2008", new Color(0, 0, 0));
  
  /* Disable outlines */
  plot.setOutlineVisible(true);

  /* Set custom labels for section*/
  plot.setLabelGenerator(new StandardPieSectionLabelGenerator("{0} ({2})"));
  
  /* Set custom label for legend */
  plot.setLegendLabelGenerator(new StandardPieSectionLabelGenerator("{0} ({2})"));
  
  
  /* create and display chart on frame */
  ChartFrame frame = new ChartFrame("JFreeChart Demo", chart);
  frame.pack();
  frame.setVisible(true);
 }
}

Output

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