import org.jfree.chart.JFreeChart;
import org.jfree.chart.ChartFactory;
import org.jfree.data.general.DefaultPieDataset;

import javax.swing.JFrame;
import java.awt.BorderLayout;
import org.jfree.chart.ChartPanel;

import org.jfree.chart.plot.RingPlot;
import java.awt.Color;

public class Test3_1 extends JFrame{
  public static void main(String[] args) {
    Test3_1 frame = new Test3_1();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 500, 500);
    frame.setTitle("グラフサンプル");
    frame.setVisible(true);
  }

  Test3_1(){

    JFreeChart chart = 
      ChartFactory.createRingChart("夏の旅行",
                                   createData(),
                                   true,
                                   false,
                                   false);

    RingPlot plot = (RingPlot)chart.getPlot();
    plot.setBackgroundPaint(Color.ORANGE);

    ChartPanel cpanel = new ChartPanel(chart);
    getContentPane().add(cpanel, BorderLayout.CENTER);
  }

  private DefaultPieDataset createData(){
    DefaultPieDataset data = new DefaultPieDataset();
    data.setValue("北海道", 35);
    data.setValue("沖縄", 28);
    data.setValue("京都", 17);
    data.setValue("大阪", 5);
    data.setValue("その他", 15);

    return data;
  }
}