我想使用jfreechart创建一个图像文件,下面是我的代码:
XYSeries xydata = new XYSeries("fitness");
for (int i = 0; i < it; i++) {
xydata.add(i,fitness[i]);
//System.out.println(fitness[i]);
}
XYSeriesCollection fitness_series = new XYSeriesCollection();
fitness_series.addSeries(