How to use

setInteriorGap

method

in

org.jfree.chart.plot.PiePlot

 public static void setPieRadius(JFreeChart chart, double radius)
{
  if (chart != null)
  {
    Plot plot = chart.getPlot();
    if (plot instanceof PiePlot)
    {
      PiePlot piePlot = (PiePlot) plot;
      double ig = 1.0 - radius;
      if (ig > PiePlot.MAX_INTERIOR_GAP)
      {
        ig = PiePlot.MAX_INTERIOR_GAP;
      }
      piePlot.setInteriorGap(ig);
    }
  }
}

pieplot.setLegendLabelToolTipGenerator(new StandardPieSectionLabelGenerator("Tooltip for legend item {0}"));
pieplot.setSimpleLabels(true);
pieplot.setInteriorGap(0.0D);

public JFreeChart createPieChart(String title, PieDataset dataset) {
  JFreeChart chart = ChartFactory.createPieChart(title, dataset, true, true, false);
  PiePlot plot = (PiePlot) chart.getPlot();
  plot.setCircular(true);
  plot.setDirection(Rotation.CLOCKWISE);
  plot.setNoDataMessage("No data to display");
  StandardPieSectionLabelGenerator labelGenerator = new StandardPieSectionLabelGenerator("{0} {1} ({2})");
  plot.setLabelGenerator(labelGenerator);
  plot.setInteriorGap(0.01);
  plot.setMaximumLabelWidth(0.32);
  Font font = new Font(chart.getLegend().getItemFont().getFamily(), Font.PLAIN, 12);
  plot.setLabelFont(font);
  plot.setLabelBackgroundPaint(new Color(220, 220, 220));
  font = new Font(chart.getLegend().getItemFont().getFamily(), Font.PLAIN, 12);
  chart.getLegend().setItemFont(font);
  return chart;
}

/**
 * Creates a pie chart.
 *
 * @return A pie chart.
 */
private static JFreeChart createPieChart() {
  JFreeChart chart = ChartFactory.createPieChart(null, null,
      false, true, false);
  chart.setBackgroundPaint(Color.white);
  PiePlot plot = (PiePlot) chart.getPlot();
  plot.setBackgroundPaint(null);
  plot.setInsets(RectangleInsets.ZERO_INSETS);
  plot.setInteriorGap(0.06);
  plot.setStartAngle(0.0);
  plot.setLabelGenerator(null);
  plot.setBaseSectionOutlinePaint(Color.white);
  plot.setBaseSectionOutlineStroke(new BasicStroke(1.2f,
      BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
  plot.setOutlineVisible(false);
  plot.setLabelBackgroundPaint(null);
  plot.setLabelOutlinePaint(null);
  plot.setLabelShadowPaint(null);
  plot.setLabelPadding(RectangleInsets.ZERO_INSETS);
  plot.setLabelFont(new Font("Dialog", Font.PLAIN, 12));
  plot.setLabelPaint(Color.gray);
  plot.setToolTipGenerator(new StandardPieToolTipGenerator("{2}"));
  return chart;
}

PiePlot pie = (PiePlot) plot;
PieDatasetChartDefinition pieDefinition = (PieDatasetChartDefinition) chartDefinition;
pie.setInteriorGap( pieDefinition.getInteriorGap() );
pie.setStartAngle( pieDefinition.getStartAngle() );
pie.setLabelFont( pieDefinition.getLabelFont() );