In this tutorial, we learn how to use the JFreeChart library. We will learn how to create various types of charts. The charts are displayed in a Swing application and saved to an image file.
The example uses a pie chart to show the market share of web servers:
JFreeChart is a popular Java library for creating charts. JFreeChart allows to create a wide variety of both interactive and non-interactive charts. We can create line charts, bar charts, area charts, scatter charts, pie charts, Gantt charts, and various specialized charts such as wind charts or bubble charts.
JFreeChart was started by David Gilbert in 2000. Today, JFreeChart is the most widely used charting library among Java developers.
In this tutorial, we will learn how to create the below commonly used charts using JFreeChart library:
- JFreeChart - Line Chart
- JFreeChart - Area Chart
- JFreeChart - Bar Chart
- JFreeChart - Pie Chart
JFreeChart Maven dependency
For our projects, we use the below Maven dependency:
<dependency>
<groupId>org.jfree</groupId>
<artifactId>jfreechart</artifactId>
<version>1.5.0</version>
</dependency>1. JFreeChart line chart
In the example, we create a line chart showing the average salary per age.A line chart is a basic type of chart that displays information as a series of data points connected by straight line segments. A line chart in JavaFX is created with the ChartFactory.createXYLineChart().
Here is the complete example to demonstrate creating a line chart with Jfreechart library:
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.block.BlockBorder;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
public class LineChartEx extends JFrame {
public LineChartEx() {
initUI();
}
private void initUI() {
XYDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setBorder(BorderFactory.createEmptyBorder(15, 15, 15, 15));
chartPanel.setBackground(Color.white);
add(chartPanel);
pack();
setTitle("Line chart");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private XYDataset createDataset() {
var series = new XYSeries("2016");
series.add(18, 567);
series.add(20, 612);
series.add(25, 800);
series.add(30, 980);
series.add(40, 1410);
series.add(50, 2350);
var dataset = new XYSeriesCollection();
dataset.addSeries(series);
return dataset;
}
private JFreeChart createChart(XYDataset dataset) {
JFreeChart chart = ChartFactory.createXYLineChart(
"Average salary per age",
"Age",
"Salary (€)",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false
);
XYPlot plot = chart.getXYPlot();
var renderer = new XYLineAndShapeRenderer();
renderer.setSeriesPaint(0, Color.RED);
renderer.setSeriesStroke(0, new BasicStroke(2.0f));
plot.setRenderer(renderer);
plot.setBackgroundPaint(Color.white);
plot.setRangeGridlinesVisible(true);
plot.setRangeGridlinePaint(Color.BLACK);
plot.setDomainGridlinesVisible(true);
plot.setDomainGridlinePaint(Color.BLACK);
chart.getLegend().setFrame(BlockBorder.NONE);
chart.setTitle(new TextTitle("Average Salary per Age",
new Font("Serif", java.awt.Font.BOLD, 18)
)
);
return chart;
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
var ex = new LineChartEx();
ex.setVisible(true);
});
}
}
Output:
Run above program will produce the below output:
2. JFreeChart area chart
An area chart displays graphically quantitative data that change over time. An area chart is created with ChartFactory.createAreaChart() method in JFreeChart.
The example shows an area chart showing world crude oil consumption by year:
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.AreaRendererEndType;
import org.jfree.chart.renderer.category.AreaRenderer;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtils;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
public class AreaChartEx extends JFrame {
public AreaChartEx() {
initUI();
}
private void initUI() {
CategoryDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setBorder(BorderFactory.createEmptyBorder(15, 15, 15, 15));
chartPanel.setBackground(Color.white);
add(chartPanel);
pack();
setTitle("Area chart");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private CategoryDataset createDataset() {
double[][] data = new double[][]{
{82502, 84026, 85007, 86216, 85559, 84491, 87672,
88575, 89837, 90701}
};
CategoryDataset dataset = DatasetUtils.createCategoryDataset(
new String[]{"Oil"}, new String[]{"2004", "2005", "2006",
"2007", "2008", "2009", "2010", "2011", "2012", "2013"},
data
);
return dataset;
}
private JFreeChart createChart(CategoryDataset dataset) {
JFreeChart chart = ChartFactory.createAreaChart(
"Oil consumption",
"Time",
"Thousands bbl/day",
dataset,
PlotOrientation.VERTICAL,
false,
true,
true
);
CategoryPlot plot = (CategoryPlot) chart.getPlot();
plot.setForegroundAlpha(0.3f);
AreaRenderer renderer = (AreaRenderer) plot.getRenderer();
renderer.setEndType(AreaRendererEndType.LEVEL);
chart.setTitle(new TextTitle("Oil consumption",
new Font("Serif", java.awt.Font.BOLD, 18))
);
return chart;
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
var ex = new AreaChartEx();
ex.setVisible(true);
});
}
}
Output:
Run above program will produce the below output:
3. JFreeChart bar chart
A bar chart presents grouped data with rectangular bars with lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally.
The below code example uses a bar chart to show the number of Olympic gold medals per country in London 2012.
package com.java.library.jfreechart;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import java.awt.Color;
import java.awt.EventQueue;
public class BarChartExample extends JFrame {
public BarChartExample() {
initUI();
}
private void initUI() {
CategoryDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setBorder(BorderFactory.createEmptyBorder(15, 15, 15, 15));
chartPanel.setBackground(Color.white);
add(chartPanel);
pack();
setTitle("Bar chart");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private CategoryDataset createDataset() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.setValue(46, "Gold medals", "USA");
dataset.setValue(38, "Gold medals", "China");
dataset.setValue(29, "Gold medals", "UK");
dataset.setValue(22, "Gold medals", "Russia");
dataset.setValue(13, "Gold medals", "South Korea");
dataset.setValue(11, "Gold medals", "Germany");
return dataset;
}
private JFreeChart createChart(CategoryDataset dataset) {
JFreeChart barChart = ChartFactory.createBarChart(
"Olympic gold medals in London",
"",
"Gold medals",
dataset,
PlotOrientation.VERTICAL,
false, true, false);
return barChart;
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
BarChartExample ex = new BarChartExample();
ex.setVisible(true);
});
}
}
Output:
Run above program will produce the below output:
4. JFreeChart pie chart
A pie chart is a circular chart that is divided into slices to illustrate numerical proportion. A pie chart is created with the ChartFactory.createPieChart() method in JFreeChart.
package com.java.library.jfreechart;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import java.awt.Color;
import java.awt.EventQueue;
public class PieChartExample extends JFrame {
private static final long serialVersionUID = 1L;
public PieChartExample() {
initUI();
}
private void initUI() {
DefaultPieDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setBorder(BorderFactory.createEmptyBorder(15, 15, 15, 15));
chartPanel.setBackground(Color.white);
add(chartPanel);
pack();
setTitle("Pie chart");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private DefaultPieDataset createDataset() {
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("Apache", 52);
dataset.setValue("Nginx", 31);
dataset.setValue("IIS", 12);
dataset.setValue("LiteSpeed", 2);
dataset.setValue("Google server", 1);
dataset.setValue("Others", 2);
return dataset;
}
private JFreeChart createChart(DefaultPieDataset dataset) {
JFreeChart pieChart = ChartFactory.createPieChart(
"Web servers market share",
dataset,
false, true, false);
return pieChart;
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
PieChartExample ex = new PieChartExample();
ex.setVisible(true);
});
}
}
Output:
Run above Java program will output:
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