如何用java生成带有测试数据的图表？

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.data.category.DefaultCategoryDataset;

import javax.swing.*;

public class ChartExample {
    public static void main(String[] args) {
        // 准备测试数据
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.addValue(120, "Series 1", "Category 1");
        dataset.addValue(200, "Series 1", "Category 2");
        dataset.addValue(150, "Series 1", "Category 3");
        dataset.addValue(80, "Series 2", "Category 1");
        dataset.addValue(100, "Series 2", "Category 2");
        dataset.addValue(90, "Series 2", "Category 3");

        // 创建柱状图对象
        JFreeChart chart = ChartFactory.createBarChart(
                "Test Chart", // 图表标题
                "Category", // X轴标签
                "Value", // Y轴标签
                dataset // 数据集
        );

        // 创建图表面板
        ChartPanel chartPanel = new ChartPanel(chart);

        // 创建窗口并显示图表
        JFrame frame = new JFrame("Chart Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 400);
        frame.setContentPane(chartPanel);
        frame.setVisible(true);
    }
}