### Question:
XYAreaRenderer extends AbstractXYItemRenderer implements XYItemRenderer, PublicCloneable { @Override public LegendItem getLegendItem(int datasetIndex, int series) { LegendItem result = null; XYPlot xyplot = getPlot(); if (xyplot != null) { XYDataset dataset = xyplot.getDataset(datasetIndex); if (dataset != null) { XYSeriesLabelGenerator lg = getLegendItemLabelGenerator(); String label = lg.generateLabel(dataset, series); String description = label; String toolTipText = null; if (getLegendItemToolTipGenerator() != null) { toolTipText = getLegendItemToolTipGenerator().generateLabel( dataset, series); } String urlText = null; if (getLegendItemURLGenerator() != null) { urlText = getLegendItemURLGenerator().generateLabel( dataset, series); } Paint paint = lookupSeriesPaint(series); result = new LegendItem(label, description, toolTipText, urlText, this.legendArea, paint); result.setLabelFont(lookupLegendTextFont(series)); Paint labelPaint = lookupLegendTextPaint(series); if (labelPaint != null) { result.setLabelPaint(labelPaint); } result.setDataset(dataset); result.setDatasetIndex(datasetIndex); result.setSeriesKey(dataset.getSeriesKey(series)); result.setSeriesIndex(series); } } return result; } XYAreaRenderer();  XYAreaRenderer(int type);  XYAreaRenderer(int type, XYToolTipGenerator toolTipGenerator,
                          XYURLGenerator urlGenerator); boolean getPlotShapes(); boolean getPlotLines(); boolean getPlotArea(); boolean isOutline(); void setOutline(boolean show); Shape getLegendArea(); void setLegendArea(Shape area); boolean getUseFillPaint(); void setUseFillPaint(boolean use); GradientPaintTransformer getGradientTransformer(); void setGradientTransformer(GradientPaintTransformer transformer); @Override XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
            XYPlot plot, XYDataset data, PlotRenderingInfo info); @Override LegendItem getLegendItem(int datasetIndex, int series); @Override void drawItem(Graphics2D g2, XYItemRendererState state,
            Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot,
            ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset,
            int series, int item, CrosshairState crosshairState, int pass); @Override Object clone(); @Override boolean equals(Object obj); @Override int hashCode(); static final int SHAPES; static final int LINES; static final int SHAPES_AND_LINES; static final int AREA; static final int AREA_AND_SHAPES; }### Answer:
@Test public void testGetLegendItemSeriesIndex() { XYSeriesCollection d1 = new XYSeriesCollection(); XYSeries s1 = new XYSeries("S1"); s1.add(1.0, 1.1); XYSeries s2 = new XYSeries("S2"); s2.add(1.0, 1.1); d1.addSeries(s1); d1.addSeries(s2); XYSeriesCollection d2 = new XYSeriesCollection(); XYSeries s3 = new XYSeries("S3"); s3.add(1.0, 1.1); XYSeries s4 = new XYSeries("S4"); s4.add(1.0, 1.1); XYSeries s5 = new XYSeries("S5"); s5.add(1.0, 1.1); d2.addSeries(s3); d2.addSeries(s4); d2.addSeries(s5); XYAreaRenderer r = new XYAreaRenderer(); XYPlot plot = new XYPlot(d1, new NumberAxis("x"), new NumberAxis("y"), r); plot.setDataset(1, d2); new JFreeChart(plot); LegendItem li = r.getLegendItem(1, 2); assertEquals("S5", li.getLabel()); assertEquals(1, li.getDatasetIndex()); assertEquals(2, li.getSeriesIndex()); }