problem with jfreechart

[albert sie]

i cannot solve my program that using jfreechart api
here is my code:

  import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.data.DefaultPieDataset;
public class First {
/**
* The starting point for the demo.
*
* @param args ignored.
*/
public static void main(String[] args) {
// create a dataset...
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("Category 1", 43.2);
dataset.setValue("Category 2", 27.9);
dataset.setValue("Category 3", 79.5);
// create a chart...
JFreeChart chart = ChartFactory.createPieChart(
"Sample Pie Chart",
dataset,
true, // legend?
true, // tooltips?
false // URLs?
);
// create and display a frame...
ChartFrame frame = new ChartFrame("First", chart);
frame.pack();
frame.setVisible(true);
}
}  

here is my problem:

C:\>javac First.java
First.java:5: cannot find symbol
symbol : class DefaultPieDataset
location: package org.jfree.data
import org.jfree.data.DefaultPieDataset;
^
First.java:14: cannot find symbol
symbol : class DefaultPieDataset
location: class First
DefaultPieDataset dataset = new DefaultPieDataset();
^
First.java:14: cannot find symbol
symbol : class DefaultPieDataset
location: class First
DefaultPieDataset dataset = new DefaultPieDataset();
^
3 errors


any one can suggest to me??


regards,
albert

[Ernest Friedman-Hill]

Google told me very quickly that this class is in package "org.jfree.data.general". You're trying to import it from the wrong package.

[albert sie]

i can compile successfully now. but when i want to run my program another problem come out again,

Exception in thread "main" java.lang.NoClassDefFoundError: First

i'm sure that the ocation i save and the file name is correct

[Jesper de Jong]

What is your classpath set to? That error means that Java can't find your class. You must set the classpath so that Java can find your class.

Setting the class path

[albert sie]

i set the classpath to the jfreechart jar file. but still cannot solve the problem, can suggest me the solution

[Ulf Dittmer]

Yes, but the missing class is not one of the JFree classes, it's "First" - probably one of your classes. It needs to be in the classpath as well.