I search the phrase "Quicksilver String Ranking Java Port" in google... cannot find some interesting result...
so i just wrote one - http://github.com/mrkschan/qs-score-java/blob/master/QSString.java
One point to note is that ... In Java (v6)... String is a final class that cannot be extended... so i have to wrap a string and make this class less convenient.
Rationale for this: i'm writing a string filter for a eclipse plug-in which i wanna use a fast and excellent string ranking algorithm. Quicksilver is the way to go :)