100％java开发的电子地图软件，电子地图放大、缩小、漫游、测距，图层查询，最短路径计算等功能。(只有class和地图文件，无源码)-100% java development of electronic mapping software, electronic maps to zoom, roaming, location, layers inquiries, the shortest path calculation capabilities. (Only class documents and maps, no source)