public static Chart chart(String toolkit) {
   AWTChartComponentFactory f = new AWTChartComponentFactory();
   return f.newChart(Chart.DEFAULT_QUALITY, toolkit);
 }
 public static Chart chart(Quality quality, String toolkit) {
   AWTChartComponentFactory f = new AWTChartComponentFactory();
   return f.newChart(quality, toolkit);
 }
 public static Chart chart(Quality quality) {
   AWTChartComponentFactory f = new AWTChartComponentFactory();
   return f.newChart(quality, Toolkit.newt);
 }