JFreeChart生成柱形图代码，jfreechart生成柱形,import java.

JFreeChart生成柱形图代码，jfreechart生成柱形,import java.

import java.awt.Font;  import javax.swing.JFrame;  import org.jfree.chart.ChartFactory;  import org.jfree.chart.ChartPanel;  import org.jfree.chart.JFreeChart;  import org.jfree.chart.axis.CategoryAxis;  import org.jfree.chart.axis.ValueAxis;  import org.jfree.chart.plot.CategoryPlot;  import org.jfree.data.category.CategoryDataset;  import org.jfree.data.category.DefaultCategoryDataset;  public class BarChartDemo {      /**      * @param args      */      public static void main(String[] args) {          JFreeChart chart = ChartFactory.createBarChart("统计", "水果", "水果种类",                  getDataSet());          // 从这里开始          CategoryPlot plot = chart.getCategoryPlot();// 获取图表区域对象          CategoryAxis domainAxis = plot.getDomainAxis(); // 水平底部列表          domainAxis.setLabelFont(new Font("黑体", Font.BOLD, 14)); // 水平底部标题          domainAxis.setTickLabelFont(new Font("宋体", Font.BOLD, 12)); // 垂直标题          ValueAxis rangeAxis = plot.getRangeAxis();// 获取柱状          rangeAxis.setLabelFont(new Font("黑体", Font.BOLD, 15));          chart.getLegend().setItemFont(new Font("黑体", Font.BOLD, 15));          chart.getTitle().setFont(new Font("宋体", Font.BOLD, 20));// 设置标题字体          ChartPanel chartPanel = new ChartPanel(chart, true); // 这里也可以用chartFrame,可以直接生成一个独立的Frame          JFrame frame=new JFrame("Java数据统计图");            frame.add(chartPanel);           //添加柱形图            frame.setBounds(50, 50, 900, 600);            frame.setVisible(true);        }      private static CategoryDataset getDataSet() {          DefaultCategoryDataset dataset = new DefaultCategoryDataset();          dataset.addValue(100, "北京", "苹果");          dataset.addValue(100, "上海", "苹果");          dataset.addValue(100, "广州", "苹果");          dataset.addValue(200, "北京", "梨子");          dataset.addValue(200, "上海", "梨子");          dataset.addValue(200, "广州", "梨子");          dataset.addValue(300, "北京", "葡萄");          dataset.addValue(300, "上海", "葡萄");          dataset.addValue(300, "广州", "葡萄");          dataset.addValue(400, "北京", "香蕉");          dataset.addValue(400, "上海", "香蕉");          dataset.addValue(400, "广州", "香蕉");          dataset.addValue(500, "北京", "荔枝");          dataset.addValue(500, "上海", "荔枝");          dataset.addValue(500, "广州", "荔枝");          return dataset;      }  }