JFreeChart-Line Chart

A line chart is a series of points connected by a straight line segments. The information is shown through these connected lines. Line chart represents how data alters at equal time frequency.

The following images show some of the demo versions of line chart incorporated in JFreeChart library:

Line Chart Demo 1:

Line Chart Demo 2:

Line Chart Demo 3:

Line Chart Demo 4:

Line Chart example

Let us consider a sample data which shows a frequent traffic on our website www.javaTpoint.com.

Date	Total number of daily visitors
2016-12-19	200
2016-12-20	150
2016-12-21	100
2016-12-22	210
2016-12-23	240
2016-12-24	195
2016-12-25	245

Date	Total number of unique visitors
2016-12-19	150
2016-12-20	130
2016-12-21	95
2016-12-22	195
2016-12-23	200
2016-12-24	180
2016-12-25	230

The following codes create a line chart from the above sample data:

LineChartExample.java

import javax.swing.JFrame;
import javax.swing.SwingUtilities;

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

public class LineChartExample extends JFrame {

  private static final long serialVersionUID = 1L;

  public LineChartExample(String title) {
    super(title);
    // Create dataset
    DefaultCategoryDataset dataset = createDataset();
    // Create chart
    JFreeChart chart = ChartFactory.createLineChart(
        "Site Traffic", // Chart title
        "Date", // X-Axis Label
        "Number of Visitor", // Y-Axis Label
        dataset
        );

    ChartPanel panel = new ChartPanel(chart);
    setContentPane(panel);
  }

  private DefaultCategoryDataset createDataset() {

    String series1 = "Visitor";
    String series2 = "Unique Visitor";

    DefaultCategoryDataset dataset = new DefaultCategoryDataset();

    dataset.addValue(200, series1, "2016-12-19");
    dataset.addValue(150, series1, "2016-12-20");
    dataset.addValue(100, series1, "2016-12-21");
    dataset.addValue(210, series1, "2016-12-22");
    dataset.addValue(240, series1, "2016-12-23");
    dataset.addValue(195, series1, "2016-12-24");
    dataset.addValue(245, series1, "2016-12-25");

    dataset.addValue(150, series2, "2016-12-19");
    dataset.addValue(130, series2, "2016-12-20");
    dataset.addValue(95, series2, "2016-12-21");
    dataset.addValue(195, series2, "2016-12-22");
    dataset.addValue(200, series2, "2016-12-23");
    dataset.addValue(180, series2, "2016-12-24");
    dataset.addValue(230, series2, "2016-12-25");

    return dataset;
  }

  public static void main(String[] args) {
    SwingUtilities.invokeLater(() -> {
      LineChartExample example = new LineChartExample("Line Chart Example");
      example.setAlwaysOnTop(true);
      example.pack();
      example.setSize(600, 400);
      example.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      example.setVisible(true);
    });
  }
}

Output:

Next TopicJfreeChart-Scatter Chart

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