A Java JFreeChart x/y plot/chart/graph example

In an effort to share some source code (but without taking the time to explain it), here’s some Java source code that I just used to create a JFreeChart chart/graph of some data that I use in my Android football game:

import java.util.*;
import java.awt.*;
import javax.swing.*;
import org.jfree.chart.*;
// import org.jfree.chart.ChartPanel;
// import org.jfree.chart.ChartFactory;
// import org.jfree.chart.JFreeChart;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.chart.plot.*;
import org.jfree.chart.axis.*;

public class Example1 implements Runnable {

    public static void main(String[] args) {
        Example1 example = new Example1();
    public void run()
        String playResults = "Play Results";
        DefaultCategoryDataset data = new DefaultCategoryDataset();

        TreeMap<Integer, Float> sortedMap = new TreeMap<>();
        for (Map.Entry<Integer,Float> entry: sortedMap.entrySet()) {
            data.addValue(entry.getValue(), playResults, entry.getKey());  //(y,x)
            // System.out.println("Adding key: " + entry.getKey());

        JFreeChart chart = ChartFactory.createLineChart(
            "Play Results", "Distance", "Possibility",
            data, PlotOrientation.VERTICAL,
            true, true, true

        // set the range for the y-axis
        CategoryPlot plot = chart.getCategoryPlot();
        NumberAxis rangeAxis = (NumberAxis)plot.getRangeAxis();
        rangeAxis.setRange(0, 15);

        JFrame frame = new JFrame("Data");
        frame.setPreferredSize(new Dimension(800, 600));
        frame.setContentPane(new ChartPanel(chart));

    public static final Map<Integer, Float> playMap = new HashMap<Integer, Float>() {{
        put(10,  1f);
        put(12,  2f);
        put(15,  4f);
        put(18,  6f);
        put(20,  6f);
        put(25,  7f);
        put(30,  6f);
        put(35,  5f);
        put(40,  5f);


The image below shows the JFrame and JFreeChart that this code creates.

Add new comment

The content of this field is kept private and will not be shown publicly.

Anonymous format

  • Allowed HTML tags: <em> <strong> <cite> <code> <ul type> <ol start type> <li> <pre>
  • Lines and paragraphs break automatically.