The first half of the book lets your feet wet and your hands dirty. In the second half we get several samples working to show you how everything comes together. Vector maps (line maps) Vs satellite or aerial imagery Spatial Databases PostgreSQL OGC
我们在构建一个MAP时，要不停的调用put，有时候看着觉得很麻烦，刚好，看了下builder模式，觉得这思路不错，于是乎，照着用builder模式写了一个构建MAP的示例，代码如下:
import java.util.HashMap;
import java.util.Map;
public class MapBuilder {
public Builder b;
public MapBuilder(Builder b){
this.b = b;
}
public Map map
