void  jButton13_actionPerformed(ActionEvent e) {
    DefaultPieDataset dataset =  new  DefaultPieDataset();
    dataset.setValue("Category 1",  43 . 2 );
    dataset.setValue("Category 2",  27 . 9 );
    dataset.setValue("Category 3",  79 . 5 );
    JFreeChart chart = ChartFactory.createPieChart(
    "Sample Pie Chart",dataset,true,true,false);
    graf= new  Grafik(chart);
    graf.pack();
    graf.setVisible(true);
  }
}

 public  Grafik  extends  JFrame{
   private  JFreeChart ch;
   public  Grafik(JFreeChart jf) {
       ch=jf;
     try  {
      jbInit();
    }
     catch (Exception e) {
      e.printStackTrace();
    }
  }
   private   void  jbInit()  throws  Exception {
        this .setTitle("график");
    ChartPanel chartPanel =  new  ChartPanel(ch, false);
        chartPanel.setPreferredSize( new  Dimension( 500 ,  270 ));
        setContentPane(chartPanel);
  }
 }
}