src/main/java/wyfs/util/Trie.java
public static Trie fromString(String str) {
		String[] components = str.split("/");
		Trie r = ROOT;
		for(int i=0;i!=components.length;++i) {
			r = r.append(components[i]);
		}
		return r;
	}
public static Trie fromString(String str) {
		String[] components = str.split("/");
		Trie r = ROOT;
		for(int i=0;i!=components.length;++i) {
			r = r.append(components[i]);
		}
		return r;
	}
Construct a Trie from a string, where '/' is the separator.
s
@param str
@return