JFreeChart APIJFreeChart它主要是用来制作各种各样的图表，这些图表包括：饼图、柱状图(普通柱状图以及堆栈柱状图)、线图、区域图、分布图、混合图、甘特图以及一些仪表盘等等。-JFreeChart APIJFreeChart It is mainly used to create a variety of charts, these charts include: pie charts, histograms (general histogram, as well as the