Chart of JFreeChart

Chart a new course with JFreeChart(JFreeChart

Tutorial)

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As a developer, I am often asked to demonstrate new applications. After

doing many demos, I noticed that users are often initially more interested in

what an application looks like than what it does. I have also noticed that one

of the best ways to make a good first impression is with a colorful, three-

dimensional chart.

compile and run the code included with this column, you must have two jar

files from the JFreeChart distribution, jfreechart-0.9.4.jar and jcommon-

0.7.1.jar, in your classpath.

Charts and datasets

To create a chart using JFreeChart, you must create a Dataset, which you

then use to create a JFreeChart. A Dataset contains the data that displays in

the chart. JFreeChart features many different Dataset objects, which you can

use to create assorted types of charts. Once you create a Dataset, you next

create the actual chart. JFreeChart uses an object appropriately named

JFreeChart to represent charts. You create JFreeChart objects from Dataset

createPieChart() method. This example will create a pie chart with the title

"Sample Pie Chart," a legend, and two slices: JavaWorld with 75 percent of

the pie, and Other with the other 25 percent:

DefaultPieDataset pieDataset = new DefaultPieDataset();

pieDataset.setValue("JavaWorld", new Integer(75));

pieDataset.setValue("Other", new Integer(25));