jfreechart 2D柱状图，怎样在柱头显示数值？
好像用的是createBarChart，不是3D形状的柱图。

怎样在柱状显示数值？
怎样对横轴进行颜色或形状设置？谢谢！

[解决办法]
先给你贴一个在柱状图显示数值的实例

Java code

import org.jfree.ui.ApplicationFrame;import org.jfree.chart.JFreeChart;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartPanel;import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;import org.jfree.chart.renderer.category.BarRenderer3D;import org.jfree.chart.plot.PlotOrientation;import org.jfree.chart.plot.CategoryPlot;import org.jfree.data.category.CategoryDataset;import org.jfree.data.category.DefaultCategoryDataset;import jxl.biff.drawing.Chart;import java.awt.*;public class BarChartDemo1 extends ApplicationFrame {    public BarChartDemo1(String title){        super(title);        JFreeChart chart=this.createBarChart(this.createDataset());        ChartPanel chartPanel=new ChartPanel(chart);        this.getContentPane().add(chartPanel);        this.setSize(new Dimension(800,600));        this.setVisible(true);    }    private CategoryDataset createDataset(){        DefaultCategoryDataset dataset=new DefaultCategoryDataset();        dataset.addValue(100,"completed","2010 June");        dataset.addValue(80,"completed","2010 July");        dataset.addValue(50,"completed","2010 August");        dataset.addValue(70,"completed","2010 September");        return dataset;    }    private JFreeChart createBarChart(CategoryDataset dataset){        String chartTitle="MyFirstBarChart";        String axisXLabel="category";        String axisYLabel="Value";        JFreeChart chart= ChartFactory.createBarChart(chartTitle,axisXLabel,axisYLabel,                dataset, PlotOrientation.VERTICAL,true,true,false);        CategoryPlot plot = chart.getCategoryPlot();        BarRenderer3D renderer = new BarRenderer3D();        renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());        renderer.setItemLabelsVisible(true);        plot.setRenderer(renderer);        return chart;    }    public static void main(String[] args) {        new BarChartDemo1("demo1");    }}