jFreechart三种图的测试代码

以下是 jFreeChart 中三种类型图的测试代码，包括折线图、柱状图和饼图：

折线图：

import org.jfree.chart.*;
import org.jfree.chart.plot.*;
import org.jfree.data.xy.*;

public class LineChartExample {
    public static void main(String[] args) {
        XYSeries series = new XYSeries("XYGraph");
        series.add(1, 1);
        series.add(2, 3);
        series.add(3, 2);
        series.add(4, 5);
        series.add(5, 4);
        series.add(6, 7);
        series.add(7, 9);
        series.add(8, 6);
        series.add(9, 8);
        series.add(10, 10);

        XYDataset xyDataset = new XYSeriesCollection(series);
        JFreeChart chart = ChartFactory.createXYLineChart("XYLine Chart", "X Axis",
                "Y Axis", xyDataset, PlotOrientation.VERTICAL, true, true,
                false);

        ChartFrame frame = new ChartFrame("XYLine Chart", chart);
        frame.setVisible(true);
        frame.setSize(300, 300);
    }
}

柱状图：

import org.jfree.chart.*;
import org.jfree.chart.plot.*;
import org.jfree.data.category.*;
import org.jfree.data.general.*;

public class BarChartExample {
    public static void main(String[] args) {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.setValue(120, "Profit", "Jan");
        dataset.setValue(135, "Profit", "Feb");
        dataset.setValue(152, "Profit", "Mar");
        dataset.setValue(187, "Profit", "Apr");
        dataset.setValue(200, "Profit", "May");
        dataset.setValue(230, "Profit", "Jun");
        dataset.setValue(280, "Profit", "Jul");
        dataset.setValue(300, "Profit", "Aug");
        dataset.setValue(320, "Profit", "Sep");
        dataset.setValue(350, "Profit", "Oct");
        dataset.setValue(370, "Profit", "Nov");
        dataset.setValue(390, "Profit", "Dec");

        JFreeChart chart = ChartFactory.createBarChart("Monthly Profit",
                "Month", "Profit", dataset, PlotOrientation.VERTICAL, true,
                true, false);

        ChartFrame frame = new ChartFrame("Bar Chart", chart);
        frame.setVisible(true);
        frame.setSize(300, 300);
    }
}

饼图：

import org.jfree.chart.*;
import org.jfree.chart.plot.*;
import org.jfree.data.general.*;
import org.jfree.util.*;

public class PieChartExample {
    public static void main(String[] args) {
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("Java", new Double(43.2));
        dataset.setValue("C++", new Double(10.0));
        dataset.setValue("Python", new Double(17.5));
        dataset.setValue("Ruby", new Double(32.5));

        JFreeChart chart = ChartFactory.createPieChart("Programming Language",
                dataset, true, true, false);

        PiePlot plot = (PiePlot) chart.getPlot();
        plot.setStartAngle(290);
        plot.setDirection(Rotation.CLOCKWISE);
        plot.setForegroundAlpha(0.5f);

        ChartFrame frame = new ChartFrame("Pie Chart", chart);
        frame.setVisible(true);
        frame.setSize(300, 300);
    }
}