jfreechart是java中统计的图形（包括饼图片，柱形图等），文档中为开发中使用的总结，解决包括一个显示中文问题，和显示百分比问题等。-JfreeChart is java statistical graphics (including the cake pictures, columns, etc.), documents used for the development of a summary, including a display solution to Chinese problems, and display the percentage of problems.