Hist4j是一个开源的绘制柱状图的Java类库，支持大数据量的现实。
Features
It adapts to any data distribution, keeping a more or less constant resolution throughout the data range by increasing the resolution where the data is more dense.
It can process large amounts of data with a very small memory footprint.
It doesn't need pre- or post-processing to deliver statistics about the data seen so far.
项目主页：http://code.google.com/p/hist4j/
下载地址：http://code.google.com/p/hist4j/downloads/list
来自:开源中国社区
