请问怎么用jfreechart做柱状图时不同柱子的颜色怎么设置，要每个柱子颜色不同，不是用renderer.setSeriesPaint(0, new Color.RED)设置每个类型的柱子的，谢谢
------解决方案--------------------
请参考代码，自己看看吧
- Java code
import java.awt.*;import javax.swing.JPanel;import org.jfree.chart.*;import org.jfree.chart.axis.NumberAxis;import org.jfree.chart.labels.*;import org.jfree.chart.plot.*;import org.jfree.chart.renderer.category.BarRenderer;import org.jfree.chart.renderer.category.CategoryItemRenderer;import org.jfree.data.category.CategoryDataset;import org.jfree.data.general.DatasetUtilities;import org.jfree.ui.*;public class BarChartDemo3 extends ApplicationFrame { static class CustomRenderer extends BarRenderer { private Paint colors[]; public Paint getItemPaint(int i, int j) { return colors[j % colors.length]; } public CustomRenderer(Paint apaint[]) { colors = apaint; } } public BarChartDemo3(String s) { super(s); CategoryDataset categorydataset = createDataset(); JFreeChart jfreechart = createChart(categorydataset); ChartPanel chartpanel = new ChartPanel(jfreechart); chartpanel.setPreferredSize(new Dimension(500, 270)); setContentPane(chartpanel); } private static CategoryDataset createDataset() { double ad[][] = { { 4D, 3D, -2D, 3D, 6D } }; return DatasetUtilities.createCategoryDataset("Series ", "Category ", ad); } private static JFreeChart createChart(CategoryDataset categorydataset) { JFreeChart ){ wit